[Cocoa-sharp] Performance of UI

[Edward Carr]

The performance problem is not a Leopard only issue. We have the same
problem when running under 10.3, 10.4 and 10.5. It's a fundamental issue
with the interop classes. I've replaced just the interop classes with ones
from an initial release when there was stackpadding and voodoo magic going
on; I forget the actual release, but I believe it is the source that was
used to build the cocoa-sharp that is still being released with Mono today.
This original (but messy) code performs much better than the current code.

Edward Carr

-----Original Message-----
From: cocoa-sharp-bounces at lists.ximian.com
[mailto:cocoa-sharp-bounces at lists.ximian.com] On Behalf Of marc hoffman
Sent: Friday, March 07, 2008 5:10 AM
To: David Jehring
Cc: Cocoa-sharp at lists.ximian.com
Subject: Re: [Cocoa-sharp] Performance of UI

David,

i too am seeing this, and it *seems* to be a leopard problem only. i  
remember speed being just fine when i first played with Cocoa# on  
10.4, last September/October, then when i switched to leopard things  
turned bad (i posted at the time). i've seen some improvements in  
general UI since 1.2.6 (i think), for example my  
MethiodHeaderConverter works fine. but even a simple app using a grid  
(such as http://www.remobjects.com?da35 slows to a crawl - and it's  
NOT the callbacks to get data or coloring info 0 its just as slow  
without).

one major culprit, i think, is the new Toolbar. it might sound silly,  
but in my first tests back when i switched to Leopard, i got the  
impression that the simple presence of a toolbar changed speed. drop  
an textedit - all is fine. drop a toolbar too, and typing got  
reaaaallllllyyyyy slloooowwww, and Mono.exe ate a full CPU, according  
to "top" while you did.

Yours,

marc hoffman

RemObjects Software
The Infrastructure Company
http://www.remobjects.com


On Mar 7, 2008, at 10:51 AM, David Jehring wrote:

> Thanks Edward, it is reassuring to hear that it is a known issue but  
> somewhat disappointing that such a fundamental problem has existed  
> for so long with no sign of it being addressed. Following the  
> initial deafeningly silent response to my post I have abandoned  
> cocoa-sharp and gone back to the somewhat more laborious task of  
> porting my clients to pure obj-c. It seems a shame but I cannot risk  
> the issue not being resolved and ending up with unusable applications.
>
> David
>
>
> On 06/03/2008 21:31, "Edward Carr" <ecarr at lightshipinc.com> wrote:
>
>> David,
>>
>> I have seen the same issue that you are seeing. We actually use a  
>> previous version of Cocoa-sharp, which performs 1000% better. I  
>> have raised this issue before in the past, but no one seemed to  
>> acknowledge it. With the previous version, we were able to put  
>> together a great performing product.
>>
>> Edward Carr
>>
>> From: cocoa-sharp-bounces at lists.ximian.com
[mailto:cocoa-sharp-bounces at lists.ximian.com 
>> ] On Behalf Of David Jehring
>> Sent: Saturday, March 01, 2008 4:46 AM
>> To: Cocoa-sharp at lists.ximian.com
>> Subject: [Cocoa-sharp] Performance of UI
>>
>> Having got to grips with writing cocoa sharp applications over the  
>> past couple of weeks I am experiencing a significant problem of UI  
>> performance, as noted in another posting earlier this week. Even a  
>> simple 'Hello world' application shows significant screen lag when  
>> resizing and consumes disproportionate CPU time, once you add a  
>> couple of views to a window resizing can consume 90% of CPU time.  
>> Typing into a text field with an event attached can produce a lag  
>> of a second or so between characters. As with all open source  
>> software when you find these things there is always a strong  
>> possibility that this is to do with local configuration, but in  
>> addition to the posting this week I note a thread called  
>> 'Performance on Leopard' last year discussing this issue with no  
>> conclusion. Are others experiencing this ? If so is there anyone  
>> with insight as to what the underlying issue is and what is  
>> required to resolve it. I see cocoa sharp as the most sensible way  
>> to bring my web service based client applications from Windows to  
>> OS X and would be very happy to contribute to the open source  
>> effort, however this issue would seem to be a bit of a showstopper.
>>
>> David
>>
>> Dr David Jehring
>>
>>
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