Hi,
I can convert the short code from jQuery to vanilla JavaScript. Sure , I can improve the sped of your website. I have extensive experience in designing and developing of Websites, Mobile Applications, Management Systems and E-commerce or Online Stores Solution from past 7+years.
I am available to start quick work on your Website & assure you to provide highly perform-able clean code within the preferred timeline
I look forward to having the opportunity to discuss the job further.
Warm Regards,
Mayank