Forum manageing the data tables
 

In an effort to increase my site speed, I am rebuilding my forum from a clean install.
I exported my data tables from phpMyAdmin and started to import them one at a time to see where the big choking point was.
When I uploaded the 'forum' table(10,237 rows), and rebuilt the forum info in admincp, I noticed my time to first byte went from a fraction of a sec, up to over 4 secs.
I see that the tables phrase, searchcore, searchcore_text, searchgroup, and searchgroup_text have all become significantly bigger, with the same amount of rows as my forum table.

I am looking for any suggestions on manageing the data tables. I have already done a significant amount of vBulletin and server optimization.
Is it necessary to keep the data in those tables?
Is there anything else I could do to work with that table in particular to make the site go faster?

Any info is greatly appreciated.
Thanks.

database.jpg
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