Thanks for providing website name. I had a look at the performance report of your website especially, collection page and it is way too slow.
I checked the parameters in red and yes, there is scope of improvement in the loading time. Firstly, I would suggest you to compress the product images in the collection grid that is actually contributing considerably for the slow loading of your page.
Secondly, I can see there are so many bad request happening such as call to swatches. If the call to that function is made which doesn't actually exist then it searches for the same and make the loading slower comparatively.
Also, you can remove the unwanted apps from your website along with the unused code from the app to significantly improve the loading time.
Please let me know if I could help you in any way. You can reach out to me anytime over Email or Skype.
Email : firstname.lastname@example.org
Skype : infoperennialsolution
Hope it helps!
I see that your mobile performance is worse than desktop and is scoring only 23% which is why your testers are facing bad page loading time.
I have looked at your homepage with Google Page speed insights, there are 3rd party apps which affect to your site speed. For example, if you don't need to use Hotjar, temporary remove it. You can check the full report here https://developers.google.com/speed/pagespeed/insights/?url=threadlogic.com&tab=desktop
Consider to optimize product images. A lot of Shopify apps available on the market. You can choose the best one from this category https://apps.shopify.com/search?q=image+optimization&st_source=
Hope my response is helpful and please Like to let me know.
Have a great day.