For some reason, whenever I've used mozilla's site, it has a horrible response time. Whether this is due to extreme load or just a crappy server, half the time

For some reason, whenever I've used mozilla's site, it has a horrible response time. Whether this is due to extreme load or just a crappy server, half the time I quit after waiting 20 seconds for a page to load (my normal wait time is less than 5 seconds). W3Schools is still an OK reference site. I haven't really looked at their tutorials.