How to Do a Free SQL Server Performance Check
Your client or boss just said, "Find out why this SQL Server is slow." You've already done a free SQL Server health check, and now you wanna investigate deeper.
Step 1: Download & run sp_BlitzFirst.
Start with wait stats, which tell you what the SQL Server has been waiting on since the service was last started, or since someone cleared wait stats with DBCC SQLPERF, whichever is more recent.