That's normal, given the large number of ticks coming in.
The actual number of indicators doesn't matter, what matters is how efficient each of them run. The number of open charts also play a part.
My computer is actually very powerful and I don´t
have lots of indicator going on.
Is there any way to improve this?
Ensure you have a sensible number of symbols "Market Watch" window
"Show All" will cause the terminal to get ticks for every symbol your broker supports which may lead to significant performance issues
Right click "Hide All" will reduce the list to the ones currently open in your terminal