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Rendering of ListGrid row highlight is slow in IE #521

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Rendering of ListGrid row highlight is slow in IE

When hovering over a ListGrid that has about 20 or more columns there is 
noticable lag between mouse pointer and the row highlight.

To illustrate the issue we are using modified showcase example from 
"smartgwtpro-2.3.zip".

I have included modified showcase files so that example "Java Data 
Integration/Custom DataSources/Simple" would have 20 columns by 20 rows 
(nothing else is modified) to make problem visible.

We have used Fidler and confirm that there is no activity is going on during 
hovering the grid, i.e. no images being loaded from cache.

We have tried this on different PCs. Our typical PC has Core 2 Duo 2,4GHz and 
2GB ram. The browser is IE8 on Windows XP.

The 3 attached modified files go under folders:

1. SimpleCustomDataSourceSample.java is in
[smartgwtpro-2.3]\samples\showcase\src\com\smartgwt\sample\showcase\client\datai
ntegration\java\datasource

2. customDataSource_user.ds.xml is in
[smartgwtpro-2.3]\samples\showcase\war\ds

3. UserDataSource.java is in
[smartgwtpro-2.3]\samples\showcase\src\com\smartgwt\sample\showcase\server\custo
mDataSource\

Original issue reported on code.google.com by pmas...@gmail.com on 8 Oct 2010 at 5:19

Attachments:

GoogleCodeExporter commented 9 years ago 
Have you tied your sample against the latest nightly build? This issue should 
no longer occur.

Original comment by sanjiv.j...@gmail.com on 13 Dec 2010 at 6:20

GoogleCodeExporter commented 9 years ago 
Just tried with the latest nightly build. It seems there is a slight 
imrovement. But still not perfect.

Original comment by pmas...@gmail.com on 15 Dec 2010 at 4:26

GoogleCodeExporter commented 9 years ago 
We don't show any lag in a PC with specs similar to those quoted.  There is a 
very small lag in older PCs in IE8 and earlier only, only when using a large 
number of columns and making them all visible at once (this test case sets a 
1200px wide grid in order to force all 20 columns to be visible).  This is 
cosmetic only and does not impact usability.

There is no lag in any modern browser including IE9.  We currently have no 
plans to spend additional time to improve IE8 further for this case.

Original comment by smartgwt...@gmail.com on 18 Apr 2012 at 12:53