> I use a Macbook Pro 2015 (8GB RAM/128 GB SSD) and I cannot run a fully featured IDE anymore. No more WebStorm or RubyMine. Vim is the only way to go!

I use an identical i5 model with Android Studio (think IntelliJ with more resource usage), an Android emulator/VM, a Gradle daemon taking up 2-3GBs for builds, Safari with umpteen tabs, Slack, Outlook and Spotify open and don't have issues with disk thrashing (or at least, none I can tell based on usage and the Activity Monitor memory pressure).

I don't know how you're forced to use Vim.

I've noticed that OSX will do what I'd like any modern OS to do and use the majority of my ram with a few things running things running. But adding more of a workload when it's using nearly 8GB doesn't instantly make it "run out of memory", more paging occurs but not nearly enough to cause disk thrashing (or be easily perceptible)