Chromium based Brave on Ubuntu 14.04 - not very responsive

Description of the issue:

I followed instructions from Abandoned users of Ubuntu 14.04 LTS
to install Chromium based brave and I it is not very responsive when I perform normal actions such as open tab, close tab, scroll etc.

Before installing apt version I built Chromium based Brave my self and it too behaved similarly.

Steps to Reproduce (add as many as necessary): 1. 2. 3.

Actual Result (gifs and screenshots are welcome!):

Expected result:
If the responsiveness of the Chromium based Brave is expected to be same as legacy one, then it is not.
Reproduces how often:

Brave Version(about:brave):

Brave 0.58.21 Chromium: 71.0.3578.98 (Official Build) (64-bit)
Revision 15234034d19b85dcd9a03b164ae89d04145d8368-refs/branch-heads/3578@{#897}
OS Linux
JavaScript V8 7.1.302.31
Flash (Disabled)
User Agent Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36
Command Line /usr/bin/brave-browser --disable-domain-reliability --disable-chrome-google-url-tracking-client --no-pings --enable-features=EnableEmojiContextMenu,DesktopPWAWindowing,fill-on-account-select,NewExtensionUpdaterService --disable-features=SharedArrayBuffer,DefaultEnableOopRasterization,VizDisplayCompositor,AutofillSaveCardSignInAfterLocalSave,AutofillServerCommunication,UnifiedConsent --flag-switches-begin --flag-switches-end
Executable Path /opt/brave.com/brave/brave-browser

Reproducible on current live release (yes/no):
yes
Additional Information:

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