Few things are more annoying on a computer than when Chrome starts acting weird. Fortunately, there are some simple fixes that can help.
Most of the time, Chrome issues are related to CPU-related problems. The browser tends to consume a large amount of CPU resources, especially when there are multiple tabs open. This often leads to slowdowns. To fix this, try closing some windows or using an app like iStat Menus to keep track of CPU usage. You can also try browsing in Incognito mode, which rejects cookies and site data, and disables extensions.
If the problem persists, you can try resetting Chrome settings by going into the Advanced options and scrolling all the way to the bottom. This resets everything back to default settings, which can sometimes help. Next, it's a good idea to start wiping out extensions that you don't use anymore. Open the Extensions page in the Settings menu and look for ones that are consuming a lot of CPU. If they are, click the icon to disable them or the bin icon to remove them completely.
Finally, if the problem still persists, you can try disabling Chrome's experimental features by entering chrome://flags into the address bar and clicking Reset all. This can sometimes speed up the browser by tweaking settings, such as using more threads to download raster images faster or loading low-priority iFrames last. However, be careful—these features are still experimental, and can break the browser if not configured correctly.