We normally have a server dedicated primarily to performing transaction log queries, but yesterday that server started having some issues that we've seen crop up on it before somewhat recently, so we've had to move that function temporarily to another server while we sort out the issue with its primary server. The backup server it's currently running on just isn't as fast and also handles other functions, so log queries will be slower than usual until we sort out the issue and move log queries back to their primary server.
If you're performing log queries other than the default past-30-days display, it should help to narrow your search terms as much as possible -- e.g., search for a specific product and date range, or search for a specific transaction ID, invoice ID, buyer name or email whenever possible.
We do apologize for the inconvenience, with our thanks for your patience and understanding.