Rust-analyzer hangs for more than 1 minute after indexing before responding to LSP requests

[stormshield-kg]

Logs output using RA_PROFILE='*>10': log1.txt
Logs output using RA_PROFILE='*: log2.txt

Perf run showing the problem (viewable using Firefox profiler): perf.tar.gz
The first 30s are the indexing time, then rust-analyzer hangs for 75s when trying to hover a struct or go to its definition.

rust-analyzer version: v0.4.2270
rustc version: rustc 1.83.0 (90b35a623 2024-11-26)

editor or extension: VSCode 1.96.3 with rust-analyzer extension v0.4.2270

Reproduction: This problem occurs on a private repository which I cannot share. It uses diesel extensively.

[ChayimFriedman2]

It doesn't seem to hang, just doing a lot of work. Indexing isn't the end of the story; it doesn't do all the work (nor it should). And diesel is known to use the trait solver extensively. So I believe this is unactionable.

Do next hovers also take that long?

[stormshield-kg]

Next hovers are fast only if the code doesn't change, but they are slow again after any code modification.

[stormshield-kg]

The slowdown didn't occur several months ago, so it might be caused by a relatively recent change in rust-analyzer.