More or less, depending on many factors though. In general it is among the most lightweight IDEs, i've even used it on an original Raspberry Pi (though that was

More or less, depending on many factors though. In general it is among the most lightweight IDEs, i've even used it on an original Raspberry Pi (though that was a few years ago) - it wasn't fast there, but it was usable which is more than can be said about most other still developed IDEs. Free Pascal is not as fast as Delphi 2 (especially if the target OS needs to use a native linker like GNU ld), for some decently sized projects it can take several seconds (or even a minute for multimillion lines of code) for a full build, though partial builds tend to be almost instant - at least in hardware released within the last 10 years (and SSDs help, like everywhere else). Of course both the language and the libraries (and Lazarus itself as an IDE and its own framework) do way more than Delphi 2, which itself was also more advanced than VB6. I do believe that the provided functionality scales well with its requirements. I'm not sure about a 400MHz P3, but i have tried a git build of Lazarus from last year on a late 2003 Athlon64 PC running Windows 7 and was very comfortable. A 400MHz P3 would be faster than an original Raspberry Pi, so i'd expect that if nothing else to be usable though might not be as comfortable as VB6 (or Delphi 2 for that matter). I do have a (IIRC) 800MHz P3 around for retro games, at some point i might try to install some lightweight Linux for fun and try to see how it performs there.