CEF Browsers Input Lag.

Development Programming & Scripting
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I have an Unreal Project in which I am loading few web pages in SWebBrowser provided by Engine. It uses CEF to show web pages. The issue is Browser lag too much. For example when I hover on an button, It takes a bit time to render that hover effect. few things I have noticed are

  1. Lag is much higher on 4k Monitor than 1080p one.
  2. When I run editor or package build in windowed mode, lag reduces very much.
  3. If I turn off the GPU acceleration from CEF Flags then also lag reduces substantially, to almost none.

I have a capable GPU with enough memory, When I run chrome in parallel it runs smoothly, But I think(my assumption only) this is happening due to GPU acceleration enabled. So I want to know what could be the reason for this ?