A browser test site, it works based on the number of your browser connection limits. ( in other words being a 'better'' browser will not necessarily load all the sea animals, it's all to do with max connections allowed)
Too much connections per server will make servers cry.
Yeah possibly cry foul.
I used tweak the max HTTP connections in Windows above the default of 6, however I've completely given up on that since I notice no significant difference.
Malware can also change those Windows HTTP connections settings.