Low loading lag Mojang screen

When I Run Minecraft Launcher So Everything Is Fine When I Give A Snapshot Loading Mojang So Lags I Don't Know What Is The Mistake If It's My Pc Thank You 

I don't see how this is a bug. While games load your computer uses a lot of resources, which can resort in a bit of lag, I personally don't have the issue, but I had it on my old, less powerful, computer. You're also using a outdated version of the launcher, make sure to turn off the "Compatibility mode" in Minecrafts properties.

Thank you 😃