it hang the app sometime

[waqas-ahmed-confiz]

sometime when i load store from server, request gets successful but json data takes time to load in store and chrome network as well that causes the whole browser tab of my app to hang, buttons in application gets super slow. if we dont get leaf data from server for treeStore then it work perfectly. but we have to get leafs data as well to make collapsible list. if u has any clue what's going wrong? it work sometime even with leaf data as well when there are 4, 5 records only in json. mostly it causes issue when there are more than 10 records all with leafs data as well.