I watch the main bundle for operator apps. No charts library unless the page is a dashboard. No 3D. Images compressed. Routes split.
I test on throttled 3G once, even if the warehouse is "on Wi-Fi," because aisle 7 is a liar.
Round trips
A lookup that needs five serial requests will feel broken. I combine location into the match response. Waterfalls are a desktop luxury.
Memory leaks on long shifts
A SPA left open for ten hours will collect photos in memory if you let it. I revoke object URLs. I do not keep every capture in a React state array for fun.
