Most vulnerabilities in modern computer systems are patched without any noticeable impact for end users. That’s not necessarily the case with Meltdown and Spectre, which strike at the very heart of microprocessors functionality. A new round of Spectre flaws have appeared, but Google is in the process of adding functionality to desktop Chrome that will block remote execution of Spectre. The downside, however, is Chrome will use even more RAM than it already does
Enforcing Site Isolation comes with a drawback, though. Using a separate renderer for every domain means more active renderers, and thus, more memory usage. Chrome is already notorious for high RAM usage, but it could be 10-13 percent higher with Site Isolation enabled. This feature already rolled out in the beta and dev channels, so some of you have experienced the effects.