On my P3 1GHz/512MB RAM (work) system, performance overall is fine. I notice that response time degrades overnight (i.e. in the morning I need to restart Eclipse.) The whole interface blocks when loading a file into the editor view and for source format--for large files this is an annoyance. The editors handle files up to 1000 lines, after that there is a big performance hit for me. I mostly edit lots of small files, so I don't consider any of these a problem.
You said you wanted to be around when I made a mistake; well, this could be it, sweetheart.