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Forget compiling; if (for example) you want to have a couple of meaty java projects open in an IDE plus an appserver plus a db tool you're way over 4Gb before doing any work. And then if you want to run the database as well, or say virtualbox, or use a browser...

Plus RAM is ridiculously cheap; I've just seen 24Gb for £100 plus VAT.

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Swapping is far more efficient on SSD and so RAM isn't such a problem. At least it works good enough in cases when you have a lot of data in heap which isn't used frequently (your example of multiple projects open).

RAM is cheap, but it still would take additional volume inside of laptop + use more power.

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