Autoptimize cache js file loading issue

I tested my website on GTMetrix, Google insights, pindom tool.
And I have found Autoptimize js loading delay error.
=================
https://XXXX.com/wp-content/cache/autoptimize/js/autoptimize_65b504f4fd06ab3a672c7d879f99befd.js
Response Version – HTTP/2.0
age
168
cache-control
max-age=30672000, public, immutable, public
cf-bgj
minify
cf-cache-status
HIT
cf-polished
origSize=2421068
cf-ray
56aad2981a5ef4b6-YVR
content-encoding
br
content-type
application/javascript; charset=utf-8
date
Tue, 25 Feb 2020 15:48:17 GMT
expect-ct
max-age=604800, report-uri=”https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct”
expires
Sun, 14 Feb 2021 15:45:29 GMT
last-modified
Tue, 25 Feb 2020 15:44:43 GMT
server
cloudflare
status
200
strict-transport-security
max-age=15552000; includeSubDomains; preload
vary
Accept-Encoding,User-Agent
x-content-type-options
nosniff
Request Version – HTTP/2.0
:authority
dev1.afinialabel.com
:method
GET
:path
/wp-content/cache/autoptimize/js/autoptimize_65b504f4fd06ab3a672c7d879f99befd.js
:scheme
https
accept
*/*
accept-encoding
gzip, deflate, br
accept-language
en-US,en;q=0.9
cookie
__cfduid=dead84829f401d13031aeb12be3d976211582645696
referer
https://XXX.com/
user-agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
==========================
This is just the result of Waterfall.
The receiving time of this file is slow( very slow )
Please let me know the reason and how I have to do for this.
Thanks!