I like the functionality of the horizontal scrollbar in the list panes, 
but I have to admit that it does cause a significant performance hit.

I thought most of the slowdown in 3.9alpha (when opening browsers etc) 
was due to the antialiased fonts, but I guess the horizontal scrollbars 
are a bigger factor.  Maybe with some MessageTally investigation 
there's a way to speed those up.

Anyway, I tried fiddling with various preferences while running the 
following benchmark:

Time millisecondsToRun: [10 timesRepeat: [Browser fullOnClass: Browser 
selector: openBrowser]]

To test, start with a fresh image, open one workspace. (Also open one 
browser first to select green "#Browser" type and then close the 
browser.)  Do a print-it on the benchmark, and then do it again twice, 
leaving the extra windows open.  (How many windows are open has a huge 
effect on performance.)  Tested on a Mac G5 - 1.8GHz.

Here are the results I saw.  ("1-10" means opening the first 1 to 10 
browsers, "11-20" is the next 10, etc)

fresh Squeak3.9alpha-6599 (alwaysHideHScrollbar is off at this update 
level):
1-10: 12994ms
11-20: 18554ms
21-30: 23814ms

fresh Squeak3.9alpha-6599 with text/list/code fonts set to Accuny-10:
1-10: 10252ms
11-20: 13857ms
21-30: 18047ms

fresh Squeak3.9alpha-6605 (alwaysHideHScrollbar is on at this update 
level):
1-10: 6698ms
11-20: 11627ms
21-30: 17238ms

fresh Squeak3.9alpha-6605 with roundedWindowCorners turned off:
1-10: 6671ms
11-20: 7976ms
21-30: 3704ms   !! (probably because of window placement)

fresh Squeak3.9alpha-6605 with text/list/code fonts set to Accuny-10:
1-10: 5980ms
11-20: 9345ms
21-30: 13153ms

fresh Squeak3.9alpha-6605 with reverseWindowStagger turned off:
1-10: 6471ms
11-20: 11486ms
21-30: 16859ms

fresh Squeak3.9alpha-6605 with all three above settings:
1-10: 3584ms
11-20: 3318ms
21-30: 3325ms


So, bottom line, if you change these particular preferences in 
3.9alpha, opening a browser is about eight times as fast if you already 
have a couple dozen windows open.

Anyway, there needs to be a balance between performance and appearance. 
  Probably some significant performance gains could be had by fiddling 
with MessageTally and improving some Morphic behavior.

- Doug


On Apr 2, 2005, at 2:45 AM, stéphane ducasse wrote:

> Propose others. I could not work with the horizontal scrollbar on.
> This is why I disable them.
> And 3.9 should not be sluggish. because we should not trade beauty for 
> a system
> that nobody uses because it is too slow.
>
> Stef
>
> On 1 avr. 05, at 23:39, Lic. Edgar J. De Cleene wrote:
>
>> On [DATE], "[NAME]" <[ADDRESS]> wrote:
>>
>>> 6604-prefers-sd
>>> Disable the preference for horizontal scrollbars that made everything
>>> so sluggish in addition to the rest :)
>> Are you reallu sure ?
>>
>> I founding several things in Preferences , what when finish 
>> collecting and
>> test submit to Mantis, but IMHO Preferences should be a user taste 
>> thing.
>>
>> Edgar
>>
>>
>>
>>
>
>