Holding down a key while dragging a component delays its movement

Hello,

Today I encountered a strange behavior of grasshopper.
Holding down a key while dragging a component delays its movement. This seems to occur when there are many components displayed on the viewport. It works fine when I don’t press any keys.
In the animation below, I’m dragging the component while holding down the ctrl key.

Animation

I’m assuming it’s caused by some key event. But I haven’t installed any plugins. Do you know what the cause is? Also, is there any solution?

I’m trying to use this to develop a plugin that sandwiches a component on a wire.

I need your help. Thank you.