@lycos please stop posting again and again, you got what you deserve. Your attitude cannot be tolerated here, all moderators agree (we discuss in backstage), and we don't have to debate with you for hours and hours. We're all voluntary, motivated people who do our best to help everyone and make Recalbox the best retrogaming plateform ever. Now if you're not happy because you don't have an answer within a minute on the chat, it's not a reason to speak like you did on the forum.
This is the end of the discussion, there is no debat possible on that.

I have a pi 2 and I was experiencing slow games that had played fine in older versions of recalbox. It was suggested that I disable the rewind feature. I did and now the more demanding games play smoothly. You should try that.

salut... alors oui j ai resolu mon probleme sans trop trop de logique m 'enfin, j ai fait un tri dans mes roms snes pour ne garder que les versions eu, du coup rien qu en reuplodant les jeux, le chemin vers les images etait ok... pour master system pareil j ai cleane mes roms pour ne garder eu et la les images ne fonctionnaient pas, j ai recree un dossier mastersystem pour les images, reup le gamelist... ca a fonctionné... bref pas si logique que ca, mais a force d acharnement cela a fonctionné...