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Main thread blocking for full server join bypass permission check #6519

Closed
Bug
#6563
Closed
Main thread blocking for full server join bypass permission check#6519
Bug
#6563
Labels
bug: confirmedConfirmed bugs in EssentialsX.

Description

@Leymooo
Leymooo
opened on Apr 18, 2026

Type of bug

Performance issue or memory leak

/ess dump all output

idc

Error log (if applicable)

No response

Bug description

Image

https://github.com/EssentialsX/Essentials/blob/2.x/Essentials/src/main/java/com/earth2me/essentials/perm/impl/LuckPermsHandler.java#L96

loadUser() always retvieves user from DataBase without any caching, you probaly want to use getUser() (get from cache if loaded) firstly and if null then loadUser(). At the context of PlayerServerFullCheckEvent, user should be always loaded.

Steps to reproduce

.

Expected behaviour

not blocking main thread

Actual behaviour

blocking main thread

Additional Information

No response

Metadata

Metadata

Assignees

No one assigned

    Labels

    bug: confirmedConfirmed bugs in EssentialsX.

    Type

    Bug

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions

    , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
     blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
Main thread blocking for full server join bypass permission check · Issue #6519 · EssentialsX/Essentials · GitHub
    Skip to content
    Main thread blocking for full server join bypass permission check #6519
    Closed
    Bug
    #6563
    Closed
    Main thread blocking for full server join bypass permission check#6519
    Bug
    #6563
    Labels
    bug: confirmedConfirmed bugs in EssentialsX.
    Description
    @Leymooo
    Leymooo
    opened on Apr 18, 2026
    Type of bug
    Performance issue or memory leak
    /ess dump all output
    idc
    Error log (if applicable)
    No response
    Bug description
    Image
    https://github.com/EssentialsX/Essentials/blob/2.x/Essentials/src/main/java/com/earth2me/essentials/perm/impl/LuckPermsHandler.java#L96
    loadUser() always retvieves user from DataBase without any caching, you probaly want to use getUser() (get from cache if loaded) firstly and if null then loadUser(). At the context of PlayerServerFullCheckEvent, user should be always loaded.
    Steps to reproduce
    .
    Expected behaviour
    not blocking main thread
    Actual behaviour
    blocking main thread
    Additional Information
    No response
    Metadata
    Metadata
    Assignees
    No one assigned
      Labels
      bug: confirmedConfirmed bugs in EssentialsX.
      Type
      Bug
      Projects
      No projects
      Milestone
      No milestone
      Relationships
      None yet
      Development
      No branches or pull requests
      Issue actions
      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Main thread blocking for full server join bypass permission check · Issue #6519 · EssentialsX/Essentials · GitHub
      Skip to content
      Main thread blocking for full server join bypass permission check #6519
      Closed
      Bug
      #6563
      Closed
      Main thread blocking for full server join bypass permission check#6519
      Bug
      #6563
      Labels
      bug: confirmedConfirmed bugs in EssentialsX.
      Description
      @Leymooo
      Leymooo
      opened on Apr 18, 2026
      Type of bug
      Performance issue or memory leak
      /ess dump all output
      idc
      Error log (if applicable)
      No response
      Bug description
      Image
      https://github.com/EssentialsX/Essentials/blob/2.x/Essentials/src/main/java/com/earth2me/essentials/perm/impl/LuckPermsHandler.java#L96
      loadUser() always retvieves user from DataBase without any caching, you probaly want to use getUser() (get from cache if loaded) firstly and if null then loadUser(). At the context of PlayerServerFullCheckEvent, user should be always loaded.
      Steps to reproduce
      .
      Expected behaviour
      not blocking main thread
      Actual behaviour
      blocking main thread
      Additional Information
      No response
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        bug: confirmedConfirmed bugs in EssentialsX.
        Type
        Bug
        Projects
        No projects
        Milestone
        No milestone
        Relationships
        None yet
        Development
        No branches or pull requests
        Issue actions
        
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Main thread blocking for full server join bypass permission check · Issue #6519 · EssentialsX/Essentials · GitHub
        Skip to content
        Main thread blocking for full server join bypass permission check #6519
        Closed
        Bug
        #6563
        Closed
        Main thread blocking for full server join bypass permission check#6519
        Bug
        #6563
        Labels
        bug: confirmedConfirmed bugs in EssentialsX.
        Description
        @Leymooo
        Leymooo
        opened on Apr 18, 2026
        Type of bug
        Performance issue or memory leak
        /ess dump all output
        idc
        Error log (if applicable)
        No response
        Bug description
        Image
        https://github.com/EssentialsX/Essentials/blob/2.x/Essentials/src/main/java/com/earth2me/essentials/perm/impl/LuckPermsHandler.java#L96
        loadUser() always retvieves user from DataBase without any caching, you probaly want to use getUser() (get from cache if loaded) firstly and if null then loadUser(). At the context of PlayerServerFullCheckEvent, user should be always loaded.
        Steps to reproduce
        .
        Expected behaviour
        not blocking main thread
        Actual behaviour
        blocking main thread
        Additional Information
        No response
        Metadata
        Metadata
        Assignees
        No one assigned
          Labels
          bug: confirmedConfirmed bugs in EssentialsX.
          Type
          Bug
          Projects
          No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
Main thread blocking for full server join bypass permission check · Issue #6519 · EssentialsX/Essentials · GitHub
          Skip to content
          Main thread blocking for full server join bypass permission check #6519
          Closed
          Bug
          #6563
          Closed
          Main thread blocking for full server join bypass permission check#6519
          Bug
          #6563
          Labels
          bug: confirmedConfirmed bugs in EssentialsX.
          Description
          @Leymooo
          Leymooo
          opened on Apr 18, 2026
          Type of bug
          Performance issue or memory leak
          /ess dump all output
          idc
          Error log (if applicable)
          No response
          Bug description
          Image
          https://github.com/EssentialsX/Essentials/blob/2.x/Essentials/src/main/java/com/earth2me/essentials/perm/impl/LuckPermsHandler.java#L96
          loadUser() always retvieves user from DataBase without any caching, you probaly want to use getUser() (get from cache if loaded) firstly and if null then loadUser(). At the context of PlayerServerFullCheckEvent, user should be always loaded.
          Steps to reproduce
          .
          Expected behaviour
          not blocking main thread
          Actual behaviour
          blocking main thread
          Additional Information
          No response
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            bug: confirmedConfirmed bugs in EssentialsX.
            Type
            Bug
            Projects
            No projects
            Milestone
            No milestone
            Relationships
            None yet
            Development
            No branches or pull requests
            Issue actions
            
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Main thread blocking for full server join bypass permission check · Issue #6519 · EssentialsX/Essentials · GitHub
            Skip to content
            Main thread blocking for full server join bypass permission check #6519
            Closed
            Bug
            #6563
            Closed
            Main thread blocking for full server join bypass permission check#6519
            Bug
            #6563
            Labels
            bug: confirmedConfirmed bugs in EssentialsX.
            Description
            @Leymooo
            Leymooo
            opened on Apr 18, 2026
            Type of bug
            Performance issue or memory leak
            /ess dump all output
            idc
            Error log (if applicable)
            No response
            Bug description
            Image
            https://github.com/EssentialsX/Essentials/blob/2.x/Essentials/src/main/java/com/earth2me/essentials/perm/impl/LuckPermsHandler.java#L96
            loadUser() always retvieves user from DataBase without any caching, you probaly want to use getUser() (get from cache if loaded) firstly and if null then loadUser(). At the context of PlayerServerFullCheckEvent, user should be always loaded.
            Steps to reproduce
            .
            Expected behaviour
            not blocking main thread
            Actual behaviour
            blocking main thread
            Additional Information
            No response
            Metadata
            Metadata
            Assignees
            No one assigned
              Labels
              bug: confirmedConfirmed bugs in EssentialsX.
              Type
              Bug
              Projects
              No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
})();
Main thread blocking for full server join bypass permission check · Issue #6519 · EssentialsX/Essentials · GitHub
              Skip to content
              Main thread blocking for full server join bypass permission check #6519
              Closed
              Bug
              #6563
              Closed
              Main thread blocking for full server join bypass permission check#6519
              Bug
              #6563
              Labels
              bug: confirmedConfirmed bugs in EssentialsX.
              Description
              @Leymooo
              Leymooo
              opened on Apr 18, 2026
              Type of bug
              Performance issue or memory leak
              /ess dump all output
              idc
              Error log (if applicable)
              No response
              Bug description
              Image
              https://github.com/EssentialsX/Essentials/blob/2.x/Essentials/src/main/java/com/earth2me/essentials/perm/impl/LuckPermsHandler.java#L96
              loadUser() always retvieves user from DataBase without any caching, you probaly want to use getUser() (get from cache if loaded) firstly and if null then loadUser(). At the context of PlayerServerFullCheckEvent, user should be always loaded.
              Steps to reproduce
              .
              Expected behaviour
              not blocking main thread
              Actual behaviour
              blocking main thread
              Additional Information
              No response
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                bug: confirmedConfirmed bugs in EssentialsX.
                Type
                Bug
                Projects
                No projects
                Milestone
                No milestone
                Relationships
                None yet
                Development
                No branches or pull requests
                Issue actions