Functions of the PushCrew plugin

Hello guys,

My site talks about various subjects (Health, Fashion, Investments, Business, Marketing …). And these subjects are separated by categories. So I need to show this specific push window for each category so that each user signs the category-specific push and thus receives push notifications of the specific subject.

So I was wondering if your plugin allows me to configure a push window for each category?

Another question … can I configure this popup window not to appear in the page loading but rather a few seconds / minutes later, or after the user drags the page so many% down?
I worry about the loading time of my pages, so I was wondering if the plugin will use scripts that will be loaded along with the page and if those scripts will degrade the performance of the page?

Do I need to use the plugin of yours or can I insert some code directly into my website?

Thanks.
Rodrigo