Comment 3 for bug 988866

From bug 298121:

Efter logging into KDE4 my system becomes sluggish for at least 10 - 15 minutes. The problem seems to be that akonadi_agent_launcher claims 1.7GB of my 2GB memory.
During the first minute after login akonadi_agent_launcher rapidly claims more and more RAM until 85-90% of my RAM is consumed. During these 10-15 minutes my hard disk is frantically active and my system is in practice not usable.

The parent process to akonadi_agent_launcher is akonadi_control.

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Deleting the concerned .dat file fixed the issue for the reporter