Try to edit a text file about 200MB in size, e.g. an sql, in my case a sql database dump.
Vim becomes unusably slow to respond to keyboard and mouse input, or at least to mousewheel scrolling.
Response time of the editor should not depend on the total size of the file being edited, be it 200MB or 20GB.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: vim 2:7.3.547-6ubuntu5
ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
Uname: Linux 3.8.0-31-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
Date: Mon Oct 14 21:45:53 2013
InstallationDate: Installed on 2013-10-11 (3 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
SourcePackage: vim
UpgradeStatus: No upgrade log present (probably fresh install)
Using pageUp and pageDown is slow too, but not as much as mousewheel scrolling which will hang vim for several minutes after just moving the wheel up or down for a few seconds.