I am looking for someone to speed up my magento website. We purchased a script from contus support and it needs optimization. The site loads extremely slow at times. We currently have the mturbo plugin installed but it doesn't cache the checkout page. So when you click on buy it takes forever!!
We are looking for some help with this and want to make sure all changes made will not affect future magento updates.
Parallelize downloads across hostnames
Combine images using CSS sprites
Leverage browser caching with expired headers
Specify image dimensions
amongst other things.
we also think optimizing the database may help as well.
Please let me know your experience as well as what you can do to speed it up.