Photopea is only good for smaller edits/files otherwise it starts lagging like crazy. That said, Affinity is quite fair fast even on huge files. You can bring

Photopea is only good for smaller edits/files otherwise it starts lagging like crazy. That said, Affinity is quite fair fast even on huge files. You can bring over like 80% of your Photoshop muscle memory. Honorable mentions depending on your needs: Figma, Penpot, Krita