Minecraft chat problems.

For the past 3 weeks my chat has been very bright and contrasted. before i go on its with all minecraft versions i go on, and im not using a texturepack, neither any mods. Also i have deleted my minecraft and reinstalled it. the reason for this is because when someone types a lot in a chat in Minecraft i drop frames from all the colors in chat, even if i turn the chat settings down it bothers me because i want to play without this laggy, bright chat. And my java is up to date i dont really know at this point. Here is some screenshots:
https://gyazo.com/c7fe05d6d04dbaabfd75b77e18427184

https://gyazo.com/2d60827ad637871b673c0db242ba79df

I dont remember if this is the default chat or not. but when i used to play it used to be right at the good spot for me it wasnt to bright or HD or contrasted and now this. :C
Please hewp..