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If is use code . in terminal or just open vs code from menu, it is taking almost 15 to 20 seconds to open. I'm using Ubuntu 18.10 in Ideapad 100 with i3 5005u 8GB ram and SAMSUNG 850 evo 250GB ssd.

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First step would be to ensure you Samsung 850 Evo is working up to capacity.

Use hdparm command to reveal speed:

$ sudo hdparm -tT /dev/nvme0n1p1

/dev/nvme0n1p1:
 Timing cached reads:   22162 MB in  2.00 seconds = 11095.29 MB/sec
 Timing buffered disk reads: 450 MB in  0.20 seconds = 2279.92 MB/sec

If the last line is less than say 1500 MB/sec you might have a problem. There are a number of places you can check to bumping up Samsung 850 EVO speed in Linux. Here is one example: Samsung SSD 850 Pro slow speed

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  • 850 evo is a SATA 3 ssd, not an nvme drive like you have, and the read speed is as expected (520mb/s) /dev/sda: Timing cached reads: 7956 MB in 2.00 seconds = 3985.68 MB/sec Timing buffered disk reads: 1558 MB in 3.00 seconds = 518.76 MB/sec
    – Ritam Chakraborty
    Nov 14, 2018 at 10:04
  • Another question, do we have to do anything else (like install some drivers) in order to install ubuntu in nvme drive?
    – Ritam Chakraborty
    Nov 14, 2018 at 10:08
  • Ubuntu 18.10 will support nvme just fine, but your BIOS needs to have nvme driver to allow you to boot directly from it.
    – Alvin Liang
    Nov 16, 2018 at 8:30
  • @RitamChakraborty Your drive speed is optimal for the SATA III bus. The slow boot issue is caused by something else.
    – WinEunuuchs2Unix
    Nov 16, 2018 at 11:53

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