SQL——只有在第一次运行时才会变慢……无法判断我的更改是否使它更快

I have a SQL script made of 3 queries that runs very slowly on the first run inside of SQL Management Studio (about 90 seconds). Subsequent runs immediately after that only take 0-5 seconds. Obviously, it's caching it. I declare and use a few keys and variables at the top, and want to know if my script modifications are making a difference in performance, but I can't if it's always faster the second time.I have a SQL script made of 3 queries that runs