This is absolutely correct. A non-technical friend&#x27;s circa-2010 15&quot; MBP with 8GB and hybrid Fusion drive (custom, by me) runs at full memory usage and high cpu utilization and is quite sluggish from my perspective. The reason? 150+ tabs open in Safari.<p>I&#x27;m not certain said friend is aware that many tabs are open or even cares, but web browsing is quite cpu and memory intensive, and can cripple even fast machines.