The following table was created with https://tableconvert.com/ and contains wireguard speed tests for various devices:

Model	Brand	Firmware-Version	Down	Up	Leitung-Down	Leitung-Up	Wired/ Wireless	Misc
O2 Box 6431	Arcadyan	v2022.1.10	8.5	4.3	40	10	Wireless
RT-AX53U	Asus	v2022.1.10	105	37.9	250	40	Wireless
FB 4020	AVM	v2022.1.10	4.4	22.16	292	46.7	Wireless
FB 7362 SL	AVM	v2022.1.10	24.1	12.9	250	40	Wireless
FB 7412	AVM	v2022.1.10	12.47	6.4	80	38	Wireless	[^3]
FB 7430	AVM	v2022.1.10	22.4	12.3	250	40	Wireless
FB 7520	AVM	v2022.1.10	77.5	37.6	250	40	Wireless
FB 7520	AVM	v2022.1.12	76.4	68.2	933.4	792	Wireless
WR1300 v1	Cudy	v2022.1.11	98.1	46.5	933.4	792	Wireless
X6 v1	Cudy	v2022.1.11	98.1	45.7	933.4	792	Wireless
DIR-860L	D-Link	v2022.1.10	99.5	38	250	40	Wireless	1
NanoPi R2S	FriendlyElc	v2022.1.10	183	37.9	250	40	Wireless
MR8300	Linksys	v2022.1.11	80	38.1	250	40	Wireless	[^3]
EX3700	Netgear	v2022.1.10	9.23	7.8	50	10	Wireless
EX6150 v1	Netgear	v2022.1.11	45.39	8.8	100	10	Wireless
EX6150 v2	Netgear	v2022.1.11	76.7	37	250	40	Wireless
WAX202	Netgear	v2022.1.11	93.6	37.5	250	40	Wireless	[^3]
WNDR3700v2	Netgear	v2022.1.10	17.2	19.3	250	40	Wireless
Archer C6 v2	TP-Link	v2022.1.11	15.1	14.2	250	40	Wireless
Archer C7 v2	TP-Link	v2022.1.12	20.8	30.6	250	40	Wireless	[^3]
Archer C7 v5	TP-Link	v2022.1.11			250	40	Wireless
CPE210 v1	TP-Link	v2022.1.10	10.7	7.28	250	40	Wireless
WDR4900 v1	TP-Link	v2022.1.11	46.7	8.64	100	10	Wireless
Mi 4A Gigabit Edition	Xiaomi	v2022.1.10	97.8	37	250	40	Wireless
Mi 4A Gigabit Edition	Xiaomi	v2022.1.12	93.8	43.6	933.4	792	Wireless
WRE-6606	Zyxel	v2022.1.10	36.5	37.3	250	40	Wireless
O2 Box 6431	Arcadyan	v2022.1.10	9.2	4.3	40	10	Wired
RT-AX53U	Asus	v2022.1.10	59	29.12	250	40	Wired	2
WR1300 v1	Cudy	v2022.1.11	73.2	42.44	933.4	792	Wired
X6 v1	Cudy	v2022.1.11	77.8	46.7	933.4	792	Wired
DIR-860L	D-Link	v2022.1.10	59.4	30.27	250	40	Wired	2
NanoPi R2S	FriendlyElc	v2022.1.10	89	35.3	250	40	Wired	2
MR8300	Linksys	v2022.1.11	93.13	34.6	250	40	Wired	2[^3]
WAX202	Netgear	v2022.1.11	49.62	26.15	250	40	Wired	2[^3]
WNDR3700v2	Netgear	v2022.1.10	15	20.15	250	40	Wired	2 (except upload which is faster)
Archer C6 v2	TP-Link	v2022.1.11	15	18.8	250	40	Wired	2
Archer C7 v2	TP-Link	v2022.1.12	18.53	32.27	250	40	Wired	2
Archer C7 v5	TP-Link	v2022.1.11	15.65	26	250	40	Wired	2
Archer C7 v5	TP-Link	v2022.1.11	17.45	31.38			Wired
CPE210 v1	TP-Link	v2022.1.10	9.87	15.12	250	40	Wired	2 (except upload which is faster)
Mi 4A Gigabit Edition	Xiaomi	v2022.1.10	58.47	29.5	250	40	Wired	2
Mi 4A Gigabit Edition	Xiaomi	v2022.1.12	71.6	44	933.4	792	Wired	2

All speedtests were done using speedtest.net

Footnotes

1. was used as an offloader for an Asus RT-AX53U ↩

2. Somehow the network card on this mainboard or the OS reduced the possible speed quite a bit compared to wireless ↩↩²↩³↩⁴↩⁵↩⁶↩⁷↩⁸↩⁹↩¹⁰↩¹¹↩¹²