User blog comment:Rappy 4187/Technical Update: September 4, 2012/@comment-1474707-20120904211843/@comment-4811793-20120905213247

We are constantly assessing our performance processes and making adjustments to balance out speed and functionality. While some delay is an inevitable byproduct of the search suggest process, if you are experiencing singificant drag please report it to us using Special:Contact and we can look into it further. Please also let us know about specific examples where search suggest is still case sensitive as well.