Speed up opencart site

IN PROGRESS
Bids
21
Avg Bid (USD)
$536
Project Budget (USD)
$250 - $750

Project Description:
I would like our page speed to score to be in the 90's on google insights. Im not concerned about our score with other speed scores like yslow, I only care about googles score.We need an opencart expert to do whatever is necessary to get a fast site. Reduce server response times, merge js and css, use sprites, add server side caching. Make sure the database is optimized to its full potential, is not using wildcards (*) when it isn't needed, proper indexing etc.

Our server has 12 gigs of RAM. We have 170,000 items and are going to have 500,000 soon and it needs to be able to handle so many items without slowing down.

Home page score ranges from 20-40
https://developers.google.com/speed/pagespeed/insights#url=http_3A_2F_2Fgobstock.com&mobile=false

Category and product page score is in the 70's
https://developers.google.com/speed/pagespeed/insights#url=http_3A_2F_2Fgobstock.com_2F11-bewitching-bats-around-50-bag-betallics-balloons.html&mobile=false

Skills required:
Database Administration, MySQL, PHP
About the employer:
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