[Evolution] IO goes crazy

[John Stile <john stilen com>]

After starting evolution and running the filters or searching in a
folder, evolution will cause "Blocks received from a block device" (bi
column in vmstat) to max out and it will stay high until I kill
evolution.

Filters are only set to act on the INBOX and it only seems to happen
when I access the Exchange server using the IMAP protocol.

Is this a known issue?  Are there any fixes? 

Thank you.