Slow sql queries

Hello,

I recently tweaked the design of my blog; this brought along some problems that I don’t really understand.

My host is saying that they have “throttled” my account because of too many slow sql queries, more specifically, this one:

UPDATE wp_options SET option_value = ‘1313385734’ WHERE option_name = ‘_transient_timeout_feed_f8bcb359117ff797c84cb0c200145731’

I have tried cleaning, optimizing, and fixing my databases both in myPHPAdmin and with Clean Options plugin. I also have uninstalled unused/unnecessary plugins.

Anyone knows what that _transient_timeout_feed_ means?

Thank you!