Load time of Meta Box fields too long

Hello,

I use WordPress and Meta Box plugin in a lot of websites.

But I have a problem with one of them, the edit page of one page is too long to load, because I need to use a lot of editors with Meta Box on the same page and each editor loads 4 CSS files, for example if I have 18 editors in 12 groups = 12*18 = 216 WYSIWYG editors * 4 = 864 requests.

I wrote a lot of mails with the support of Meta Box and they make for me differents fixs, the first one is a JS trick, and the second a CSS trick, in fact we don’t load the CSS for dashicons, for tinyMCE skin (WP), WP skin (WP) and for Yoast SEO plugin, only the CSS for tinyMCE skin (WP) is loading.

So, the load time of the edit page is better, but now I want to improve the speed because is always too long, and I think about caching the CSS or the page ?

The editor of Meta Box don’t know how to do that, so if you have any ideas ?

Thank you !