First, you will get better help if you post on the Weaver forum as this one is not monitored.
https://forum.weavertheme.com/
If you are having speed issue, it is more likely to be linked to your WordPress installation, your plugins, and or browser, than your machine.
There are many things to check if the Customizer does not load, please read the article below for what to check.
https://guide.weavertheme.com/settings-wont-save-from-customizer/
That said, WP customizer is inherently slow when dealing with a lot of options (some browsers are worst than others), nothing the theme can do to fix that, it will have to be done by WordPress.
If none of the things explained in the article above help, you can deactivate Xtreme Customizer and use the Legacy Admin in Appearance > Weaver Xtreme Admin > Main options pages.
Deactivate the Customizer in Weaver Xtreme Admin > Advanced options > Admin Options > Disable Xtreme Customizer. This will keep the basic WordPress Customizer, but will remove all the Theme options from it, making it faster and lighter to load.
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This reply was modified 7 years, 4 months ago by scrambler.
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This reply was modified 7 years, 4 months ago by scrambler.
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This reply was modified 7 years, 4 months ago by scrambler.
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This reply was modified 7 years, 4 months ago by scrambler.