[How to trim what is beyond & delay while painting]

I have made clipping mask. Theoretically, for the first look, it works. I switch to outline view. Looks right. There is nothing outside. Then i mark all layers and physically nothing has changed. The selection shows that there are still uncut elements.

[How to trim what is beyond & delay while painting]

Thanks for the quick response.

Unfortunately,  the "\" key did not help. A good preview option, but it does not remove what is outside.  If someone puts this file as a repeating pattern, it will not work. 

Brush lag probably has been repaired. I have no idea what was wrong :)

[How to trim what is beyond & delay while painting]

Hi everyone,

I have two problems and I can not find an answer anywhere.

1. How to crop / rid everything what is outside the artboard? Unfortunately clipping mask doesn't help.

I speak exactly about seamless pattern.

 

2. When I start painting, the brush reaction is delayed. The initial line appears after a while. Is there any way to correct this?

 

Thanks for the hint!