Rather than modifying your dependencies in the cache directory (which is really not a good idea), consider cloning the repo directly. You can use a patch entry in your Cargo.toml to have all references to iced_wgpu point to your local modified copy.

rust-analyzer I believe will compile all the deps the first time it runs. This will take some time but after that it should be fast. If you run a cargo clean that will wipe everything and you will have to wait again. So dont do that. clean should be something you run sparingly not before every compile.

You don't need to not use ra. Using ra-multiplex should improve your ra experience significantly.

With nvim, you can use vim.lsp.rpc.connect() in your setup.

Not related to your question at all, but:

I don't recommend editing the source code from cargo's files. Instead, the correct way to modify a dependency would be making a fork and using it as a gift dependency (or path dependency, which is even easier).

No solution, but I have a similar issue with the higher crate.

There the /prelude/src/lib.rs file lets rust-analyzer lose its mind and allocate gigabytes upon gigabytes of memory, even though the file compiles just fine and nearly instantaneous...

I think this has something to do with recursive macros. Doesn't iced also have such? I have faint memories of a column! macro?

only thing that i can think off is that your ra install could be out of date? this sounds like some old ra bugs?

if its not tat, idk