Creating Patterns In Middle Of Song Is Very Slow?

hallo, i found out today that creating new patterns in the middle of a song is very slow (there are 256 patterns and i wanted to make 16 patterns in the middle) - cpu is @ 28% - when i create patterns @ the end of the song it is very quick - so is it only that slow because it puts the rest of the song one pattern forward when creating a new pattern? i needed nearly 4 min to create 16 patterns… i’m working with win 7 , 4 gig ram and a core i5 480m processor, so this should be pretty fast…

http://www.renoise.com/board/index.php?/topic/33692-inserting-new-patterns-is-slow-in-large-projects/

sorry didn`t saw this post before…