jQuery Grid Plugin - jqGrid - Topic: Performance improvements for scrolling in grid http://www.trirand.com/blog/?page_id=393/feature-request/performance-improvements-for-scrolling-in-grid Simple:Press Version 5.7.5.3 tony on Performance improvements for scrolling in grid http://www.trirand.com/blog/?page_id=393/feature-request/performance-improvements-for-scrolling-in-grid#p22592 Feature Request http://www.trirand.com/blog/?page_id=393/feature-request/performance-improvements-for-scrolling-in-grid#p22592 Thanks Klaus,

Make a better change (imho).

See here:

https://github.com/tonytomov/jqGrid/commit/217fa14cbb1a804095cd78eeb595072c380b8191

Tony

]]> Tue, 29 Mar 2011 17:22:25 +0300 Klaus on Performance improvements for scrolling in grid http://www.trirand.com/blog/?page_id=393/feature-request/performance-improvements-for-scrolling-in-grid#p22545 Feature Request http://www.trirand.com/blog/?page_id=393/feature-request/performance-improvements-for-scrolling-in-grid#p22545 Hello,

I've detected performance problem when scrolling in big grids, because the browser checks every row if it's visible.

Could this be improved the following way, or are their any circumstances where this solution does not work?

populateVisible: function() {

  ...

  var table = $("table:first", grid.bDiv);

  - var rows = $("> tbody > tr:gt(0):visible:first", table);
  - var rh = rows.outerHeight() || grid.prevRowHeight;

  + var rows = $("> tbody > tr:eq(1)", table);
  + var rh = rows.length ? (rows.outerHeight() || grid.prevRowHeight) : grid.prevRowHeight;

    // avoid slow selector (performance). Row 0 is the invisible "jqgfirstrow"
    // so row 1 (eq(1)) is the first visible row, we can therefor optimize this selector
    // and avoid numRowsInTable :visible checks which are very slow

  ...

Or is there a better solution?

Kind regards,

Klaus.

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