Hello,
We are a professional team of web developer as well as designer and our expertise in PHP, HTML, CSS, UI/UX, MySQL, jquery, JavaScript, Responsive HTML HTML5/CSS3, AJAX, etc. And we will speed up google sheet JavaScript function and your website fully from the starting cause there is several factor which causes lower speed. I have a full team for the SEO and they will check the functionality of existing website and will work on its functionality to increase its response on desktop as well on mobile.
<< Looking forward to hear from you soon.
Thanks,
Peter