Глеб Смирнов <glebsmirnov0708@gmail.com> writes:

> The problem is that running eglot with rust-analyzer on my project
> causes major input lag. Profiling shows that the problem is in
> synchronous and slow function jsonrpc--log-event that is called on each
> server request or response. Disabling this function with (advice-add
> 'jsonrpc--log-event :override #'ignore) solves the problem.

To be more precise the problem is that jsonrpc--log-event is pretty
printing every reply from the server and they can be quite large and
nested.  I am attaching Gleb's profiler report, as a screenshot, but
this should be enough to give a better understanding of the problem.