Big thanks for the optimization! It certainly did optimize the loop processing by several folds!
However, for my case, I found that the ultimate bottleneck was the plug-in function that I was using that froze the browser the longest. The actual insert to the DOM took a bit of time also and did freeze the browser, but wasn't too bad even in IE6. By the way, do you have any tips on emptying a large amount of content in the DOM? Such as emptying that whole chunk of HTML that was inserted. That also freezes the browser also. I'm currently using $(el).empty(); and not sure if there's a more optimal solution. Thanks! On Feb 5, 5:25 pm, "Michael Geary" <m...@mg.to> wrote: > "...there is not much room for improvement left." > > You just know that when you say that, someone will come along with a 20x-40x > improvement. ;-) > > http://mg.to/test/loop1.html > > http://mg.to/test/loop2.html > > Try them in IE, where the performance is the worst and matters the most. > > On my test machine, the first one runs about 6.3 seconds and the second one > about 0.13 seconds. > > -Mike > > > From: Ricardo Tomasi > > > Concatenating into a string is already much faster than > > appending in each loop, there is not much room for > > improvement left. What you can do improve user experience > > though is split that into a recursive function over a > > setTimeout, so that the browser doesn't freeze and you can > > display a nice loading animation. > > > On Feb 5, 5:03 pm, James <james.gp....@gmail.com> wrote: > > > I need tips on optimizing a large DOM insert to lessen the > > "freeze" on > > > the browser. > > > > Scenario: > > > I receive a large amount of JSON 'data' through AJAX from a > > database > > > (sorted the way I want viewed), and loop through them to > > add to a JS > > > string, and insert that chunk of string into a tbody of a > > table. Then, > > > I run a plug-in that formats the table (with pagination, etc.). > > > Simplified sample code: > > > > var html = ''; > > > $.each(data, function(i, row) { > > > html += '<tr><td>data from json</td></tr>';}); > > > > $("tbody").append(html); > > > $("table").formatTable(); > > > > formatTable() requires that the table has to be "completed" > > before it > > > can be executed. > > > Is there any way I can optimize this better? I think I've read > > > somewhere that making a string too long is not good, but I've also > > > read that updating the DOM on each iteration is even worst. > > > > Any advice would be appreciated! > >
