Shader compilation and network lags

Each new location with shader compilation leads to network instability.
The game becomes unplayable due to freezing and network lag.
The only way to fix this is to exit character select mode and load the character again.
The issue can be reproduced in new locations, and every time the network becomes unstable.
Lags and freezes persist after the compilation is complete and remain until you relogin or reselect character.

Same location.
1) After shader compilation. Crazy latency spikes up to 1000ms.

1) After relogin. Stable 70 ms.