Speed Test Plugin Recommendations?

I have been having some issues with a client site recently that has begun to load very very slowly. Yes, it’s hosted on GoDaddy and that may be the issue (client is looking into that) but in the meantime I would like to do some tests on the site for overall load speed, plugin load times, and also the number of database queries for specific pages/posts in order to optimize the site. Is there a reputable plugin you use for these types of tests? Thanks!