1) Fixed.
2) Site performance depends not just on theme. If problem with the payment depends on the site speed try to optimize and speed up the site to avoid stalling. We have changed the cache plugin from WP Fastest Cache to W3 Total Cache and improved the site speed a little bit. Proceed with other optimization options: images optimization, remove all the unnecessary plugins etc. If you need help with site optimization you can submit a request to WPKraken team.
