SWOS pixel shader low fps

Hi, I have a problem for a long time... When I set the screen enhancement option to "pixel scaler" the game stutters terribly (3-6 fps). I set it to open gl shader, it's ok! I don't want to play on this setting because it is worse graphics. Link to the error below, I would be grateful for help Regards.

thanks for the answer. Setting it to " none and 2x " didn't help:( I managed another way... When I start the game, I have to press ctrl+alt+delete at the same time. Maybe it's stupid but it works I also noticed that with this option I have very large CPU power consumption and I don't know why. Regards.