I just turned on another layer of caching that should help a little. 

You can decrease the number of reviews you are trying to load. Can you send me a link to your site?

It should be minified. Which file is it flagging?

Can you post a link to the site please?

Add this CSS to the custom CSS for the review template..

.wpproslider_t4_IMG_2 {
display:none;
}
.wprevpro_t1_IMG_4 {
display:none;
}
.wpproslider_t2_IMG_2{
display:none;
}
.wpproslider_t3_avatar{
display:none;
}

Yes you can do that. The best way is to use the Section if your theme supports it. Otherwise, I would use the div html in a custom html section. You can find instructions on the templates page after you create a template.

You will need to remove the app from the Shopify Admin > Apps page. Then you can re-add the free version if you want.

If you could get a csv file of the reviews you could possibly import them using the CSV file import button on the Review List page. You would need to manually enter a review first, then download the CSV file, then copy and paste your etsy reviews in to that CSV file. That way it would be in the correct format when you uploaded it back in.

I'm working to update the app to include an automated download, but it's pretty far off.

You can do that with some custom CSS. Just add this to the custom CSS setting on the review template...

.wprev_preview_tcolor2_T1 {
display: none;
}
.wprev_preview_tcolor2_T2 {
display: none;
}
.wprev_preview_tcolor2_T3 {
display: none;
}
.wprev_preview_tcolor1_T4 {
display: none;
}