I have a map with 800 markers and my customer have trouble

Hi,

I have a map with 800 markers and my customer have trouble on Firefox on Windows 8, sometimes, the script is stopped.
I try on my mac on Chrome, Safari and Firefox, no problem, it take between 30 s and 2 mn but it's ok.
How can I disable the agm_mh_footer creation, not hiding but disable it. May be, the html rendering should be faster without it.

May be you have another solution.
Can you show me a map with more than 700 markers elsewhere?

Best regards
Régis