Really easy and quick way to check your ping (takes 1-2 seconds)
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This method takes literally 1-2 seconds to check your ping before you play. I've been using it for years and didn't realize that other people may not know it.
*This is on Windows 10
Step 1: Press the Windows key on your keyboard
Step 2: (just start typing) ping google.com -t
Hit enter after and you're done!
This doesn't show your true ping to the league servers but it lets you know if your ping is stable and you can use it to find out your league ping.
For example, my in game ping is usually 52/56 ms. When I do, ping google.com -t, it'll show either a constant 38 ms or constant 60 ms in the command prompt. As long as I see that the ping is constant after running the command, I know that my league ping will be stable.
If you do, ping google.com -t, and you see the ping jumps from 38ms to 107ms and other scattered values then you will most likely lag while in game. Keep in mind that the command prompt may show 50ms while your league ping could be lower, 20ms or so, the most important thing is that the 50ms shown in the command prompt is constant.
If you're not on Windows 10 you can open the command prompt and do the same thing.
Step 1: Search/Run "cmd"
Step 2: type "ping google.com -t"
Press Enter and you should get the same results. Hope this helped those who needed it.