wifi signal slows if bluetooth enabled on iPad Pro 11

I finally found the answer. What @lotusPilot said is definitely true. If the WiFi you connected is 2.4 GHz then it will interfere and cause this issue.

When you have the issue. You can solve it in this way:

If you are connected to apple pencil and Bluetooth and you are having WiFi download speed loss.

1) Open settings, turn off Bluetooth from settings.

2) Check if apple pencil is still connected. If it is working when you touch the screen with the pencil, It means you didn't turn off the Bluetooth. So turn it off from settings.

3) Once you did it, check your download speed again ( you can do it from speedtest.net). Ipad pro will gain its download speed power.

If you did it and it didn't work. Then first you should go to settings. Go to General . Go to "Reset Network Settings" tap it and reset your all network settings and do the steps above. Then the issue would be solved.

I don't have 5GHz option in my modem settings. It is using 2.4 GHz. But I can create a 2.4 GHz guest network. Do you think it works?

Edit: Also I want to state that, After I restart ipad pro and turned off the bluetooth. Ipad pro regains its wifi signal power fully. As I use ipad pro with pencil it goes down again. Perhaps android devices interfering too. I dont know what exactly happening

I tried this:

I used my adroid device as a hotspot while it is taking signal from a Base station.

I connected my Ipad to my android device with wifi .

The speedtest Ipad and the result was 30 mgbit. It was also 30 mgbit for my android phone.

Then I connected my apple pencil to Ipad by turning on bluetooth. I speedtest Ipad now the result is 15 mgbit. while it is still 30 mgbit for android device.

So what the problem is ? I think problem is either ipad or pencil. If it is ipad, should I return it ?

I realize it doesnt recover untill I restart my ipad. After restarting it gains its wifi signal power.