In the Video Settings, drop your Render Distance to 6 or 8 chunks. The 1.12 engine renders blocks differently than 1.5.2; lowering this distance is the single best way to fix lag.
Absolutely. This is the primary use case. As long as the school hasn’t blocked the specific website or WebSocket ports, you’re good. eaglercraft 12110
: Developers have released unofficial forks of popular plugins like Dynmap specifically for the 1.21.10 update to maintain server functionality. What is Eaglercraft? In the Video Settings, drop your Render Distance