I am wondering if i have only 4GB ram and somehow(virtualbox,browser) isn't enough and i cannot proceed to upgrade(due to ultrabook and soldered memory) will swap held in SSD help the overall performance??
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Swap on SSD is going to be much faster than swap on a magnetic HDD. But it's still going to be pretty bad compared to having sufficient RAM.
Also, if you're thrashing to SSD, that's going to cause a lot of writes—it may wear out your SSD.
I'd suggest looking into zram and/or zswap to make your 4GB go further.