For those having stability problems because of the newer smooth animations, Stig just released a patch:
'...added a "Low spec" patch for those with crashing issues, If you don't you can ignore it. It reverts all the caching behavior to default and limits the animation loops to 20 frames each. The same as how the game has always been prior to 0.12.3. Just copy the image.rpy contained the in .zip to the game's \game folder. You should not need to overwrite anything.'
Also because the thread hasn't yet been updated to the 'proper' 0.12.4 general release yet - your results may vary using the incest patch and/or the low spec patch on the test version - I recommend either waiting until OP gets updated with the latest release or even better get it legitimately by subscribing to Stiglet's Patreon! $5 patrons get the newest version...
With that said if you want to try out the low spec patch now, I attached it below...