Texture compression on creates visible artifacts, off it leads to stutters about stk-code HOT 4 OPEN

Regarding performance, for me somehow disabling compression only results in increased fps regardless of advanced graphics level and track it seems (I tested Snow Peak and Black Forest with graphics 3 and 5 against 17 bots).

from stk-code.

Regarding performance, for me somehow disabling compression only results in increased fps regardless of advanced graphics level and track it seems (I tested Snow Peak and Black Forest with graphics 3 and 5 against 17 bots).

For reference the data shared by kimden on discord:

I tried latest git (not my custom client) with disabled addon karts (just in case it affects something) and measured my fps and ram against 17 karts (middle value given at finish line for uniformity):
Snow Peak, graphics 3, compression on: 71/80/89 280mb
Snow Peak, graphics 3, compression off: 75/87/93 634mb
Black Forest, graphics 3, compression on: 35/46/54 403mb
Black Forest, graphics 3, compression off: 46/59/70 756mb
Snow Peak, graphics 5, compression on: 41/50/50 288mb
Snow Peak, graphics 5, compression off: 52/70/71 615mb
Black Forest, graphics 5, compression on: 24/31/35 399mb
Black Forest, graphics 5, compression off: 29/38/42 773mb
And no I didn't confuse on and off, it really has more fps for me when not compressing

@kimden What GPU are you using ? I'm wondering if you don't get a performance hit because you don't exceed RAM limits, while @PoketMarty would have VRAM swapping. Not sure what else could explain such drastically different reports.

from stk-code.

The above is obtained using Intel Iris Plus Graphics G7, I don't know how much memory it has. (I can try NVIDIA GeForce MX330, 2Gb also if needed.)

from stk-code.

I probably forgot to say it here but I tested nvidia with texture compression and it works exactly like the issue description (huge lags), it also uses huge amounts of RAM and with some other settings I cannot even start the game because of that.

UPD. I measured the exact amount of RAM for intel and nvidia if you are interested (unfortunately not with standard client, I forgot about it, but I guess graphics wise it's the same thing). Performance seems to drop only when there's much RAM used.

Also some shared memory problems suddenly appeared while using no compression, I wonder what that could be

from stk-code.