Plugin installation is not a difficult task. Everyone can do that either by FTP client or from WordPress dashboard. But can everyone find slow plugins those take time to load when someone open your blog? I think this is pretty threatening and not yet so fast progression with any manual method. You can use GTMetrix, Pingdom etc. to find slow plugins from the web.
Here is a plugin which is known as P3 or Plugin Performance Profiler which would perceive plugins those are making your blog very slow. You will get a result based on the time runtime by plugin.
It will also illustrate the total load time, site load time, plugin load time, theme load time, core load time, margin of error, memory usage, number of PHP ticks and MySQL Queries.
How to find slow plugins using P3?
Then click on Start Scan button and select Auto Scan for a better result. The Manual Scan might not be able to scan entire directory.
Therefore, you will a detailed result that will have all kind of loading time. That’s it! Hope this plugin will help you a lot.