https://bugs.kde.org/show_bug.cgi?id=399208
--- Comment #3 from Keziolio <keziolio...@gmail.com> --- I compiled okular 1.1.3 and 1.0.3 and the problem was still present, I'm pretty sure that the regression was more recent than that... So where should I look? I haven't noticed this kind of slowdown in other parts of the system, there's something that breaks okular in a specific way... I think the problem can be worked around by consuming the input as fast as possible and updating the page position once every screen refresh, I can mind a bad framerate but not 30+ seconds of latency, I think this is still an okular issue, but I was not even able to find the relevant file/function in the okular source code and it's not that well documented, if someone can help in that regard that'll be great This is the output of perf top when the latency is rolling: Samples: 347K of event 'cycles:ppp', 4000 Hz, Event count (approx.): 74074580252 Overhead Shared Object Symbol 34.75% [kernel] [k] copy_user_enhanced_fast_string 3.13% [kernel] [k] __check_object_size 1.64% libc-2.28.so [.] __memmove_avx_unaligned_erms 1.38% [kernel] [k] __radix_tree_lookup 1.03% perf [.] hpp__sort_overhead -- You are receiving this mail because: You are the assignee for the bug.
