The idea is to: prevent re-renders, minimize code execution during re-renders, use imperative code to update heavily updated components if needed, use stable CSS instead of CSS-in-JS, lazy-load what can be lazy-loaded, remove useless code in bundle

• Images (better upscale with Real-ESRGAN, better minification with squoosh)
• Use CSS as much as possible instead of JSS
• Use imperative code to rewrite AnimatedNumber (Optimize AnimatedNumber #95), tooltip (Rewrite tooltip #103), etc.
• Tower/Wall CSS anim
• Tower/Wall rerender
• Card pos CSS anim, context rerender
• Card rerender
• Resource and Resource Production rerender
• Lang change
• Some other react components' rerender
• Remove some useless code in bundle

See also #109 Lazyload multiplayer code