We've been running into a problem with one client:SELECT COUNT(*) FROM tbl;takes 0.25 seconds on one db, and 0.06 seconds on another. Consistently. That's a fourfold difference. There aren't any significant configuration differences (like query cache, etc.), the software versions are the same, and the table fits into memory. This has been looked at by at least 3 in-house MySQL experts, and the only thing we can determine is that it's a hardware difference.Th