Gauravk

This
<div id="google_translate_element">

provokes your defer parsing.

Move it before the JavaScript code for loading, along with the google translate script.

Caching of external resources is not something that you can control 😉 

Result of several quick tests
1. Many validation errors html5
https://validator.w3.org/nu/?doc=https%3A%2F%2Fcarnity.com%2F
2. Errors in validation CSS Level 3
http://jigsaw.w3.org/css-validator/validator?uri=https%3A%2F%2Fcarnity.com%2F&amp;profile=css3svg&amp;usermedium=all&amp;warning=1&amp;vextwarning=&amp;lang=bg
3. Complete report of resources in your site. Each row with a click shows more information.
https://yellowlab.tools/result/f6sg7azukt
4. For a GtMetrix report - you use a cloudflare - this makes analysis difficult.
Perhaps it is good to stop a cloudflare, to do a good optimization of everything your site uses, then to activate cloudflare.
5. Also, see Lighthouse report your performance.

I would think about which of these external services you actually need. 

Use a free CDN service such as Cloudflare, configure it and that should take care of most of your issues which are not image related..
For defer parsing of Javascript. Login into your ACP, go to your default theme and under Custom, change JavaScript include location to Just before body tag.

I would consider that chart completely useless without data or observation how your site actually performs. That chart doesn’t show that. How fast does your server respond? When does it start rendering? When it it finished? How much useful information is shown to the user while that is happening? That is what matters. 
Going by just the graph and what is easily feasible:
1. Why are there redirects? I would check that out. 
2. Browser caching. You absolutely want to have that and it can usually be solved with a few lines in the htaccess file. 

How can I reduce that by half at least, as we have long articles that ended up being extra long due to this generous spacing?

That’s a theme issue. SuperGrid has spacing there. 

You have errors in your custom.css. That’s why the SuperGrid CSS isn’t executed at all. 
At first glance, the styling for “.ipsNavBar_primary > ul > li > a ” is missing a bracket. But there might be more. 

So the enhancements are all position and style related? Any plans to add badly needed customer metrics? Site owners sell advertising, but paying advertisers have no feedback metrics. When I saw the title of this mod I got excited hoping for this functionality. Even a basic click count that advertisers could view would be great.

So when you are releasing an update for 4.3.X?

It was released. Please update newest version.

Bought this app, recently and after using it for a while I love it thoroughly. Great work was done by everyone involved. Keep it up.
Few suggestions to make it more appealing for intense usage.
https://carnity.com/classifieds/
Classifieds App Suggestions:
Every category should have an option to check whether members can post an advert in that category or not (in case it's used as root/placeholder category only). Like in my case I don't want people to post an advert in Audi, BMW, Cadillac but instead in their sub category like Audi - A4, BMW - X5, Cadillac - Escalade etc. Every category should have its own index page, to load all adverts (controlled number) place in its sub categories. Like when someone clicks on Audi, they should see all adverts place under all sub categories of Audi, instead of showing sub-cat that is already displayed on right side - https://carnity.com/classifieds/audi Every category should have the option to add filters on the sidebar, to better search the required advert based on type, condition, option and extra custom fields. We can let people search faster for 2012 model Audi A4 for sale with Automatic gear. There should be an option to show/hide poster name, posting date and show advertisers other option for community admin to decide to use/show or not - already achieved by code edits (hit and trial). Happy to help others. There should be a sidebar on advert page too, showing advert feed from same sub category along with category listing at the same level. Example Audi A4 advert should have other Audi A4 feed on the top right followed with Audi sub category showing links to other Audi categories like A4, A6, A8, TT etc. 

Bought this app, recently and after using it for a while I love it thoroughly. Great work was done by everyone involved. Keep it up.
Few suggestions to make it more appealing for intense usage.
https://carnity.com/classifieds/
Classifieds App Suggestions:
Every category should have an option to check whether members can post an advert in that category or not (in case it's used as root/placeholder category only). Like in my case I don't want people to post an advert in Audi, BMW, Cadillac but instead in their sub category like Audi - A4, BMW - X5, Cadillac - Escalade etc. Every category should have its own index page, to load all adverts (controlled number) place in its sub categories. Like when someone clicks on Audi, they should see all adverts place under all sub categories of Audi, instead of showing sub-cat that is already displayed on right side - https://carnity.com/classifieds/audi Every category should have the option to add filters on the sidebar, to better search the required advert based on type, condition, option and extra custom fields. We can let people search faster for 2012 model Audi A4 for sale with Automatic gear. There should be an option to show/hide poster name, posting date and show advertisers other option for community admin to decide to use/show or not - already achieved by code edits (hit and trial). Happy to help others. There should be a sidebar on advert page too, showing advert feed from same sub category along with category listing at the same level. Example Audi A4 advert should have other Audi A4 feed on the top right followed with Audi sub category showing links to other Audi categories like A4, A6, A8, TT etc. 

Bought this app, recently and after using it for a while I love it thoroughly. Great work was done by everyone involved. Keep it up.
Few suggestions to make it more appealing for intense usage.
https://carnity.com/classifieds/
Classifieds App Suggestions:
Every category should have an option to check whether members can post an advert in that category or not (in case it's used as root/placeholder category only). Like in my case I don't want people to post an advert in Audi, BMW, Cadillac but instead in their sub category like Audi - A4, BMW - X5, Cadillac - Escalade etc. Every category should have its own index page, to load all adverts (controlled number) place in its sub categories. Like when someone clicks on Audi, they should see all adverts place under all sub categories of Audi, instead of showing sub-cat that is already displayed on right side - https://carnity.com/classifieds/audi Every category should have the option to add filters on the sidebar, to better search the required advert based on type, condition, option and extra custom fields. We can let people search faster for 2012 model Audi A4 for sale with Automatic gear. There should be an option to show/hide poster name, posting date and show advertisers other option for community admin to decide to use/show or not - already achieved by code edits (hit and trial). Happy to help others. There should be a sidebar on advert page too, showing advert feed from same sub category along with category listing at the same level. Example Audi A4 advert should have other Audi A4 feed on the top right followed with Audi sub category showing links to other Audi categories like A4, A6, A8, TT etc. 

Bought this app, recently and after using it for a while I love it thoroughly. Great work was done by everyone involved. Keep it up.
Few suggestions to make it more appealing for intense usage.
https://carnity.com/classifieds/
Classifieds App Suggestions:
Every category should have an option to check whether members can post an advert in that category or not (in case it's used as root/placeholder category only). Like in my case I don't want people to post an advert in Audi, BMW, Cadillac but instead in their sub category like Audi - A4, BMW - X5, Cadillac - Escalade etc. Every category should have its own index page, to load all adverts (controlled number) place in its sub categories. Like when someone clicks on Audi, they should see all adverts place under all sub categories of Audi, instead of showing sub-cat that is already displayed on right side - https://carnity.com/classifieds/audi Every category should have the option to add filters on the sidebar, to better search the required advert based on type, condition, option and extra custom fields. We can let people search faster for 2012 model Audi A4 for sale with Automatic gear. There should be an option to show/hide poster name, posting date and show advertisers other option for community admin to decide to use/show or not - already achieved by code edits (hit and trial). Happy to help others. There should be a sidebar on advert page too, showing advert feed from same sub category along with category listing at the same level. Example Audi A4 advert should have other Audi A4 feed on the top right followed with Audi sub category showing links to other Audi categories like A4, A6, A8, TT etc.