Summary:
The game will be lagged if /effect gives players too many effects at once.

Steps to Reproduce:

1. Download and import the attached world
2. Turn on the lever (FYI: This command runs /effect 10000 times)
3. Observe the state of the game

Expected Results:
The game isn't lagged

Observed Results:
The game is very slow

Notes:
According to the NVIDIA performance overlay, I got 9 FPS, but CPU usage was only 13 to 20%.

My PC specs:
CPU: AMD Ryzen 7 5700X
GPU: NVIDIA GeForce RTX 4060 Ti
RAM: DDR4 16GB