Personal Anecdote: Every time I've tried using rust-analyzer in another editor I've ended up going back to CLion (an IntelliJ-based IDE from JetBrains). The CLion experience is far superior in my personal experience. The speed difference is barely noticeable on my system while the completions, etc. are far more accurate with CLion. For example, with rust-analyzer on one of my projects, it sometimes suggests hundreds of possible completions for in a certain context whereas CLion (accurately) only suggests a handful. The integrated debugger support has been quite nice too.