I found an issue on using fast Internet connection. Uploading works quite slow and upload speed indication is quite inaccurate.
The Internet connection speed is 100Mbps. And it gets stuck on a few seconds every 20Mb. I found that 20Mb is the size of temp file that is creating in php temp folder. It means that the stuck happens when the file is moving from the temp folder to the final destination.
I didn't set limits that can influence such behavior (actual limits much higher everywhere). So it means that this setting is somewhere in FileRun.
I would like to edit it and increase this temp chunk file size. Because a moving file action takes the same time as uploading 20Mb for a such internet connection speed.
Upload speed indicator shows the speed excluding the time for a temp file moving. The actual uploading speed is 2x slower.
PS: when I use a local 1Gbits connection this stuck takes much less time and doesn't affect so much the uploading speed. I think a ping latency somehow affects this behavior.
Customer support service by UserEcho