Scrolling in less/more is slow
By cesp... on April 12, 2011 00:57 (imported from Google Code)
What steps will reproduce the problem?
- Open a new iterm 2 terminal/tab.
- Open a large text file with less ($ less myfile)
- Scroll up and down
What is the expected output? What do you see instead?
I expect nice smooth scrolling. Instead, it is slow and sometimes jerky.
What version of the product are you using? On what operating system?
I've tested on the Alpha and the latest nightly (as of 4/10). I'm on a pretty beefy macbook pro with OS X 10.6.6.
Please provide any additional information below.
I've done some experimentation and I've had some pretty annoying results:
- If I disable blur, transparency, and anti-aliasing, it's not as bad (but still noticeable).
- When I enable these things individually they each seem to contribute a little bit more to the general slowness of the scrolling.
- The problem is much worse in a new terminal than one with a lot of text. Watch the scroll bar as you scroll down within What steps will reproduce the problem?
- Open a new iterm 2 terminal/tab.
- Open a large text file with less ($ less myfile)
- Scroll up and down
What is the expected output? What do you see instead?
I expect nice smooth scrolling. Instead, it is slow and sometimes jerky.
What version of the product are you using? On what operating system?
I've tested on the Alpha and the latest nightly (as of 4/10). I'm on a pretty beefy macbook pro with OS X 10.6.6.
Please provide any additional information below.
I've done some experimentation and I've had some pretty annoying results:
- If I disable blur, transparency, and anti-aliasing, it's not as bad (but still noticeable).
- When I enable these things individually they each seem to contribute a little bit more to the general slowness of the scrolling.
- The problem is much worse in a new terminal than one with a lot of text. Watch the scroll bar as you scroll down within lessWhat steps will reproduce the problem?
- Open a new iterm 2 terminal/tab.
- Open a large text file with less ($ less myfile)
- Scroll up and down
What is the expected output? What do you see instead?
I expect nice smooth scrolling. Instead, it is slow and sometimes jerky.
What version of the product are you using? On what operating system?
I've tested on the Alpha and the latest nightly (as of 4/10). I'm on a pretty beefy macbook pro with OS X 10.6.6.
Please provide any additional information below.
I've done some experimentation and I've had some pretty annoying results:
- If I disable blur, transparency, and anti-aliasing, it's not as bad (but still noticeable).
- When I enable these things individually they each seem to contribute a little bit more to the general slowness of the scrolling.
- The problem is much worse in a new terminal than one with a lot of text. Watch the scroll bar as you scroll down within `less in a new terminal: it jumps around as it resizes. When there's a bunch of text, it doesn't have to resize as you scroll and the performance is better. There is some kind of correlation here.