The Delphi IDE Fix Pack from Andy Hausladen in truly incredible.  At work we have a very large Delphi project (core application has about 3.9 million lines of code) and using the Delphi IDE was painfully slow—doing a ‘Find Declaration’ would lock the IDE for minutes.  After installing the IDE Fix Pack the IDE is now useable (and the same ‘Find Declaration’ now it works within a few seconds).  Kudos to Andy Hausladen for a wonderful piece of software!