I am extremely qualified for Website speed optimization because I have done it many times; specially for BigCommerce website speed optimization.
I will increase your BigCommerce website's homepage score for Mobile & Desktop at Google Pagespeed Insights for $50 with deliver in 5-7 days.
I will also provide you before and after speed optimization scales, so you can see the progress.
You can choose any 1 speed test tool from Google Pagespeed Insights, GTmetrix, Pingdom as a benchmark for this work.
An initial discussion is needed before accept this Gig, Let's discuss about it.