better performance when splitting to filesink

[elsec dummy]

hi. i have encountered a strange behaviour. i have a simple pipeline on an
IMX8mm board that starts with an ov5640 camera and displays on the screen
(wayland). i have a latency of 3 frames. when i split the pipeline (tee)
first to the screen and second to a filesink the latency improves to 2 even
1 frame. does someone know why does the filesink improve the performance or
how can i simulate it without the filesink
pipeline:
1) gst-launch-1.0 v4l2src ! <caps> ! waylandsink sync=false
2) gst-launch-1.0 v4l2src ! <caps> ! tee name=t ! queue ! waylandsink
sync=false t. ! queue ! filesink location=test.avi

thanks
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