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Window / RenderWindow lags occasionally for up to 100ms

« on: April 09, 2021, 10:33:55 am »

UPDATE!!
Turned out I was using in built Intel graphics, changing it to dedicated graphics card kinda solved it... taking around 5ms, let me know if this is normal (for something like GeForce 840M low end graphics card) it now goes like 60 fps on 800*600 and 1920*1080, 25 fps on 1920*2160.

Now displaying takes 5 times the time it draws... more reasonable, but I'd like more if possible (It's just a few triangles (1000), and only one draw call... maybe my graphics card is just REALLY BAD)

Main profiler - new loop: 1
Main profiler - poll events: 13
Main profiler - graphene movement test: 6
Main profiler - graphene spawn element: 242
Spawn layout generator: 2
       Generate layout: 303
                                        Triangles: 1016
                  Draw: 1601
               Display: 174618
5fps

This is the timings of each part of game loop using sf::Clock.
poll event took 13us
generating vertex array with my own function with 1016 triangles took 303us
drawing a single vertex array to the renderwindow took 1601us

However window->display() took up to 174ms, well over 20ms most of the cycles.

Here is a sample of time window->display() took for a few cycles:

(click to show/hide)

10fps
               Display: 8520
46fps
               Display: 32877
24fps
               Display: 28428
33fps
               Display: 28748
32fps
               Display: 33446
22fps
               Display: 21339
41fps
               Display: 29773
30fps
               Display: 29936
30fps
               Display: 29797
32fps
               Display: 31445
30fps
               Display: 34606
28fps
               Display: 32469
28fps
               Display: 31490
29fps
               Display: 31927
29fps
               Display: 33826
14fps
               Display: 1545
429fps
               Display: 35023
27fps
               Display: 37010
26fps
               Display: 35281
26fps
               Display: 34500
13fps
               Display: 1902
369fps
               Display: 35636
27fps
               Display: 35628
13fps
               Display: 1368
451fps
               Display: 37175
26fps
               Display: 38083
12fps
               Display: 2375
269fps
               Display: 38247
25fps
               Display: 38992
12fps
               Display: 1510
410fps
               Display: 40545
23fps
               Display: 38150
11fps
               Display: 1934
350fps
               Display: 42024
20fps
               Display: 82159
12fps
               Display: 11240
62fps
               Display: 28280
25fps
               Display: 38575
25fps
               Display: 44938
10fps
               Display: 2280
293fps
               Display: 44944
22fps
               Display: 45327
19fps
               Display: 39925
24fps
               Display: 2717
265fps
               Display: 43975
22fps
               Display: 94987
10fps
               Display: 10716
84fps
               Display: 1818
277fps
               Display: 47146
20fps
               Display: 92366
10fps
               Display: 7352
67fps
               Display: 33882
27fps
               Display: 48984
10fps
               Display: 2449
198fps
               Display: 48376
13fps
               Display: 27405
11fps
               Display: 1872
354fps
               Display: 52004
19fps
               Display: 50053
10fps
               Display: 2184
300fps
               Display: 53196
9fps
               Display: 2035
130fps
               Display: 57235
17fps
               Display: 60270
9fps
               Display: 2554
269fps
               Display: 69510
11fps
               Display: 36312
11fps
               Display: 1661
388fps
               Display: 57477
16fps
               Display: 50891
9fps
               Display: 8979
94fps
               Display: 9000
14fps
               Display: 3967
53fps
               Display: 61478
16fps
               Display: 57759
16fps
               Display: 49832
18fps
               Display: 55554
17fps
               Display: 63664

As you can see, there is a few cycles that displayed very fast.

I tried vsync, framerate limit...

Here is the code for window displaying:

void renderUI() {
                LayoutGenerator layoutGenerator(this);
                layoutGenerator.generateLayout(_rootElement, Vector2f(0, 0), Vector2f((float)_window->getSize().x, (float)_window->getSize().y));
                _window->draw(layoutGenerator.getVertexArray()->getBuffer(), layoutGenerator.getVertexArray()->getSize(), sf::Triangles);
                _window->display();
        }

Edit:
And the slowness is worse when maximized to 1920*1080, 90% of the cycles take over 100ms to do window display, while 5-10% is less than 2ms
Data above is on 800*600

And window.clear does not solve it, I don't think I need it anyways

Update:
The context settings was ContextSettings(0, 0, 4, 0, 4, 0, false); (anti-aliasing level 4)
And turn it down to 0(no aa)@800*600 made it go 30fps on average (30ms window.display time)
full screen 1920*1080 with no aa is still 100ms+
Although without aa 800*600 feels much smoother (mainly because of less stutter, not faster framerates), but still really bad. How can I fix it? I already turned off multi threading on my graphics driver.