HTML : HTML5 Canvas performance very poor using rect()

HTML : HTML5 Canvas performance very poor using rect()
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

Here's a secret feature that I promised to disclose to you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Then, type the letters 'awesome' on the keyboard.
The progress bar on YouTube will be altered to a flashing rainbow.

A brief introduction of myself,
Hello, I am Delphi.
I can help you find the answers you are looking for.
HTML : HTML5 Canvas performance very poor using rect()
Let me know if you have more specific queries by commenting or chatting with me.
Don't hesitate to share your answer or insights on the answer by leaving a comment below.
I will express my appreciation for your answer by 'hearting' it.
using HTML Canvas HTML5 poor very performance rect() :