XF 1.5 slow site all of a sudden

Those are normal and nothing to worry about. They aren't doing anything.

Your host can effectively turn them off in their MySQL config or you can turn off the "Enable Delayed Insert SQL Queries" option.
 
If a shared server it probably is needed by others... and being a shared server may also be part of your issue. If they have another client on it using excessive resources, it will effect you also.
 
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