Vsync only works only after a restart, so toggling it ingame doesn't have immediate effect.
↑ PCGamingWiki user discussion - (Serious Sam 2 Vsync) Do not edit the article if you do not know about the topic - last accessed on ' I guess i've figured it out.↑ Serious Sam II : Screenshot Comparison - last accessed on May 2023.↑ Serious Sam II Patch 2.070 Comments - last accessed on May 2023.↑ Serious Sam 2 - Wait, what?! Serious Sam 2 Update 2.090 is Live! - Steam News - last accessed on.↑ Steam Community :: Group Announcements :: Serious Sam 2 - Yeehaaa! Serious Sam 2 now uses Steamworks for online play! - last accessed on May 2023.↑ Steam official announcements - last accessed on May 2023.
