Hi, > I am using Apache Flex 4.15.0 and AIR 20.0
Have you tried using Scout? I find that give a much clearer picture of where the time is being spent. From a quick look it looks like ObjectUtil.getValue/getSortValueField is taking up a lot of the time (25%). You may want to sort of the self time column to see is anything is taking more time. What do you have in the ArrayCollection that you are sorting/filtering? Form a quick look the way getSortValueField is calling getValue it looks rather inefficient for a simple case as it would be creating and throwing away a large number of arrays, also if you have a formatter defined for the column that going to be called a large number of times. This code was changed to support complex fields [1] so it may be (but I’ve not looked into it) that a performance issue has been introduced for a simple case. You may want to double check by testing the performance with 4.14 SDK (which is missing this support) and see if there a difference. Thanks, Justin 1. https://issues.apache.org/jira/browse/FLEX-34852
