ios - UITableView lags when implementing infinite scrolling -


my table scrolls smoothly when data has been loaded on screen , not loading more, however, trying figure why table lags when new data loaded onto table approximately 0.5 sec. have performed time profiler hoping see blocking main thread when more data loaded.

the time profiler indicated main thread took 399ms whilst other function implemented took 49ms in total. leaves me no clue hunt down cause of lag. why time profile give me 399ms on main function instead of giving me call tree how 399ms came about?

i wondering if there way track down cause of lag while loading more data?

instrument result


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