Is your Joomla powered website running slow? Maybe you just upgraded from v1.5 to 2.5?
Good news is that there is most likely a fix for this.
The issue lies in the “Assets” table of your mysql installation that needs to be repaired, and there is a script available to do this at : https://github.com/ikajaste/Joomla-2.5-Asset-Weaver
Many thanks to Eoin O’Sullivan for the tip on this.