Using xrdp-egfx server (with va-api hardware acceleration support) and noticing 80 - 90% load + stuttering with freshly built freerdp2 3.14. The Debian package freerdp2-x11 version 2.10 vastly outperforms this newer one.

Arguments: /gfx:AVC444:on /gfx:progressive:on /gfx:RFX:on (tested all variations)

The server supports AVC444 and AVC420 but both produce similar results.

Your post in Issue #3251 (from 2016) suggests that this is related to the AVC444 codec.

Software decoding of that codec requires more performance (and is currently less optimized than the old codecs are), looks like your system can not handle that properly and causes lag (which in turn reduces video quality).

Is there a specific setting I could try to improve things?