Hey, this guide doesn't apply to bedrock. It's written for Java, they are catastrophically different. They were written using different programing languages. The version this guide is written for is written in Java. While bedrock is written in c++. And no shared code is used between them.

Bedrock optimization.:

There's not much to do since bedrock is highly optimized already.

Method 1:
Even the Intel HD (now UHD[​no difference]) can run it fluently. So there may be a virus in your computer,
The built-in Windows Defender should be enough. Scan your whole system.
After Defender finishes scanning you should scan with Malwarebytes, google it.

Method 2:
Go to in-game settings and lower chunk distance. Lower Anti-Aliasing. Turn off fancy clouds and the rest. And on world generation lower simulation distance. Go to task manager, and on the top there should be 'details' on there find something mentioning minecraft, right click select priority and select high.(you need to do this every time you open it.)

Method 3:
Press the windows keys and x, a window should pop up. Select PowerShell (Admin) and paste this into it.

powercfg -duplicatescheme e9a42b02-d5df-448d-aa00-03f14749eb61
After that press windows key+x again and this time select Power Options, on the left side of the settings app there should be "additional power settings" click that, on there should be "Ultimate Performance" click the circle left of it and exit. (If its not there click Hide Additional Power Plans)That's it, i suspect that the case is you have a virus or your anti virus is crap.And
registering on any website on the web requires you to be above the age 13 (due to law).

someone from the future. try clicking details on the java process it should lead you to javaw.exe

its called a lag spike, u need to remove some mods, so minecraft has room for memory

Sorry to say, but you're the idiot here.