Load Time Speed Optimization of our existing Word Press web site especially MOBILE version

Our current website loads really slow especially on Mobile. Super Quick Load Time Mobile Speed is our priority with some medium improvement also required for desktop load speed as well. Also the Search/Filter feature near the top of our home page needs to be raised up or tweaked as it does not display properly/completely on mobile. Also reduce size of filter boxes to match size of words as takes up too much horizontal space. Our Web Site is: Q- U- E- E- N- S- R- E- N- T- A- L- S dot C- A We need the project to be cloned onto the successful Freelancer's server to test and compare before and after speeds with our current live site which must in no way be impaired or affected. Winning bidder must guarantee minimum Page Speeds compared with current speeds and must show before (current speed) on all formats and browsers and predict and guaratee minimum "After" speed using Google PageSpeed or similar tools. Serious bidders must explain in clear common non-technical language what they proposed to do to attain our desired results as well as a time frame and what we would need to provide in terms of access to our current page and content to avoid multiple back and forth emails wasting everyone's time. Successful coder must also perform the upload or conversion of the tweaked/improved site onto our servers at Gator and monitor it and guarantee its performance improvements for 120 days minimum,. Short vague responses from coders with low ratings or low feedback will not be accepted. Any serious bidders must show a strong history of similar work with many positive results showing an aptitude and track record of doing exactly what we require.