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I've been playing with large TCP windows to see how fast I can get a single connection to be. And I noticed that Opera 19, which is basically a rebranded Google Chrome, scored consistently poorly in every test. It is probably important to note that the operating system is Windows XP. To explore the issue further, I downloaded the latest vanilla Chromium 40, and I also scaled back the system's TCP window to ~512 kB so as to get it within reasonable range. The results were the same as the other day. Trans-Atlantic speed is limited to ~450 kB/s. TestMy.net results are consistent with LeaseWeb test bins (Washington DC and the Netherlands on the screenshot). The Receive Window has been capped to 65535 bytes without scaling, disregarding what I have configured in the OS. Firefox 27 side by side with the other browser delivers decent speed. The speed from Washington DC increased about 9 times from 450 kB/s to 3.8 MB/s. (Firefox download manager is still dumb because it won't show neither the speed, nor the address of the download source.) SpeedGuide Analyzer reports that my receive window is 64240 * 8 = 513920 bytes exactly as I configured it. It is quite likely that Chromium (Opera 15+, Chrome) perform better with SPDY or under Windows 7, which can auto-tune the receive window, which I am unable to test at the moment. Somebody else could report what overseas speeds they are getting using Chrome (America to Netherlands, or to Singapore). Chromium is definitely not the best choice for "legacy" systems running Windows 2000/XP, or maybe if Windows 7 is manually configured in the old fashion with the TCP Optimizer. Chrome sucks..