I hadn't noticed, but I checked and mine goes from about 4% on the homepage to around 70% usage on the 10 Years page. It drops back to 4-5% after the balloons are gone. It's not really an issue, but interesting how much CPU Chrome is using for those balloons. Here are my specs if it matters:
Someone with a 4690K reporting in: Not getting any performance issues, but CPU usage does spike to 100% utilization and full speed for a couple of seconds when loading and reloading the page, according to task manager. Other details if they matter: Latest version of Windows 10 Pro 64-bit, latest version of Firefox Quantum 64-bit, and 16GBs of 1600 MHz DDR3 RAM.
Also tried this on my 128GB ROM 4GB RAM version of the Surface 3 with more of less the same software as my desktop: It does top out at 100% utilization and full speed for a bit longer with about a second of stutter when the balloons start loading in, but I wouldn't describe the performance as "crippling" or "abnormal", more like "typical" since that Atom can only do so much at one time.
Just for fun, I could revert my desktop to my original build with a Celeron G1840 and 4GBs of RAM and do some testing, but I'm low on thermal paste.
I have a modest Core i5 running at 3Ghz with 8Gb RAM, Windows 10 64bit and an Nvidia 1070, running whatever the latest build of Chrome is. CPU usage goes up to 10% while balloons are on-screen but drops back to 3-4% when they're gone.
@justin258: It's a 2015 MacBook Pro, Intel Core i7, 2.2GHz, 16 GB of RAM.
I don't know if this is due to beta macOS, or beta Safari 12 issue. Firefox has pretty smooth animations, but the CPU load seems high, although I'll admit I've never looked much at my CPU usage on other sites. CNN actually does about as much load.