Jquery treegrid plugin freezes when table contains more 2500 records (rows)

[kvelaro]

Today we noticed, that table which has more 2500 records freezes browser's tab. Tab becomes unresponsive, browser continuously loads something (load icon is animating infinitively)

If I switch off plugin call, data is loaded as expected, normal. If I set Timeout browser loads data, data displayed until timeout then tab freezes.