Minecraft crashes again and again what to do?

When I start Minecraft everything works but if I make a TP or a Shader it always crashes and if I write something in the Chat sometimes crashes it too I have already reinstalled MC and restarted the PC several times what to do? (ps: it does not react anymore)

That may be because your PC is too weak.

1. He is fully good 2. I can even play Forza Horizon 4 on 60FPS xD

One possibility is that it's on your PC / laptop. What is your RAM, your CPU (processor speed) and GPU (graphics card)?

If you have windows, you can look it up in the addiction map.

A second possibility would be that the shader is not compatible with your Minecraft. Check if this one is for the correct Minecraft version and you have not installed any addons for Minecraft that make this incompatible.

Why this crashes when you write something in the chat, I can't say…

Well I play Minecraft since March 2018 with the PC Always 1.8.9 with Labymod always the same shader and never is but now suddenly the net goes more