Hi,
I have read your exact requirement in which you have mentioned that you want your existing site should be more speedup.
Please share the URL of the site so I can check the current performance.
Relevant Skills and Experience
I have +6 years experience in Wordpress.
Following some steps I will do:compression,caching,leverage browser caching,optimize images minify css and js,add expires headers,database optimization etc
Proposed Milestones
$100 AUD - speed up
I will optimize the site so the load time will be under 4S with a great performance on gtmetrix and Insight Google Page speed.