Cannot Match Refresh Rate over Miracast

fan1bsb97 · 03 Jan 2022

Hi! I'm a teacher and have to teach from home this week. I have a new Samsung TV, and when I connect the laptop to it with an hdmi cable everything is fine. However I want to extend my screen to the TV without the cable.

I do this via miracast and it connects just fine. However the mouse is incredibly laggy once it moves to the tv monitor. Apparently this has to do with the refresh rate. Unfortunately, I am unable to change it from 30. I did change the resolution, and was able to make it 60 when I did that, but it had the same problem.

This happens on both my personal laptop and the school laptop.

Cannot Match Refresh Rate over Miracast-untitled-4.jpg

Cannot Match Refresh Rate over Miracast-samsung-display.jpg

HP ProBook 650 G4
Device name DESKTOP-79A23CR
Processor Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz 2.71 GHz
Installed RAM 16.0 GB (15.8 GB usable)
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display

Edition Windows 10 Pro
Version 21H1
Installed on ‎8/‎2/‎2020
OS build 19043.1288
Experience Windows Feature Experience Pack 120.2212.3920.0

This is the TV: SAMSUNG 32-inch Class LED Smart FHD TV 1080P (UN32N5300AFXZA, 2018 Model)
This is the wireless card I recently installed: NETELY Wireless-AC 9260NGW NGFF M2 Interface WiFi Bluetooth Adapter-Wireless-AC 2030Mbps (2.4GHz 300Mbps & 5GHz 160MHz 1730Mbps) Network Card with Bluetooth 5.0(Wireless-AC 9260NGW)

Please let me know what other information is needed.

Thanks so much!

nIGHTmAYOR · 04 Jan 2022

To put it plain and simple this matter can not be resolved , but can be slightly improved *

I have gone through this whole hassle about a couple years ago only it was a projector not a tv , first of I'd like you to know that 30 Hz is not what causes the lag , 30 Hz equates to 30 fps (frames per second) , and movies you watch play at 24 fps and yet you see them play smooth .

So what is the problem then why the lag ? It is the matter of poor support from all manufacturers to this form of streaming , while a lot believe Intel 9260 NGF and Intel AX 200 are cutting edge Wifi cards I assure you Realtek cards supersede them by so far in the matter of connectivity , range and bandwidth capabilities through my tests despite all the marketing Intel likes to throw at us .

Mind you another bottle neck is Miracast itself , the software client does not use GPU hardware acceleration , instead it uses CPU and only 1 core believe it or not .

So in case you want this to run in near decent quality you have to have a Realtek AC Dual Band or above Wifi card combined with a CPU rated 3 GHz + just for the bandwidth to be right and the software processing to get the highest speed possible from that one core and then it will still be 30 Hz or 30 fps unless one day Samsung decides to write a decent driver for PCs which is never going to happen .

Basically this whole wireless video projections was made for mobile world and PCs are taking baby to no steps at all at it .

Finally maybe what you need is to find yourself an Android tablet and play your presentations on it and that is probably going to run smooth and cost less than attempting to get that job done through PC (Laptop even) .

* P.S : You can reduce the lag by a small margin if you set the Intel Driver to Performance in both 3D and Power section of the Intel Control Panel accessible through right clicking desktop or heading to Windows Control Panel and expanding its view . Also you can attempt to use different connection to internet other than Wifi (Wired maybe? or a GSM dongle?) so not to divide bandwidth over 2 concurrent Wifi connections .

fan1bsb97 · 04 Jan 2022

Thank you so much for your explanation!

It actually works ok with the microsoft wireless display adapter so I think I'll just use that.