High speed and good performance is Health card of any website.
I have done it many time, I can do it for you also. Firstly I need Site Url because no attachment found as you said in your proposal.
Yes Its a common problem, when ever new media image or picture or animated file is uploaded performance label will go down gradually because of unoptimizes images and jquery-js-css is there for image
We have to vary careful over this point. I hope same thing happen for your case, I will solve it.
You want following thing to do speed and make good report for your site:-
Combine images using CSS sprite? Optimize image? Examine SmushIT? Replace Plugin? Served scaled images?
But it only be possible when you provide me the site link to survey. There are many other Factor works for bad report in GTmetix like:
- CSS optimization.
- large number inline css also played a very bad role.
- Jquery optimization
- Coding standered not apropiate.
- Broken links.
- UN-Usefull pagess
All this points are key factor at the time Report card generate in GTmetrix, But in your case I think Image optimization and jquery is the main culprit, But all this things are my prediction over your statement in proposal, I am only be able to say anything concretely only when you provide me the site URL.
For myself, I am php developer and Expert in Wordpress, Drupal, Codeigniter, Magento, Laravel and custom php with plugins.
Feel free to start discussion, and want to verify my ability, ask related question