So, two things:
1) setting maxupdates = 0; in ajaxWDwx.js will only cause your clientraw.txt to be fetched by anyone browsing your page at every 10 seconds based on your setting of
var reloadTime = 10000; // reload AJAX conditions every 5 seconds (= 5000 ms)
and server processing for .txt files is negligible. A PHP page would be much more server intensive than a text file, so I wouldn't worry about that.
2) the font mismatch you cite is likely caused by HTML errors in the page.. do a validation and correct any errata cited, then the font should display as you expect. With HTML errata, the browser 'tries' to do what it thinks you want, but sometimes gets it wrong -- the only way to ensure perfect presentation is to have perfect HTML for the browser to see.