Relative to what you define as "smooth". igpu's were never meant for gaming, you can't enjoy it at 20 fps either but whatever. A quick google search shows you do not meet the minimum requirements to run the game (in terms of GPU) - so not really a Plutonium issue. Upgrade your hardware.
Also you not being able to load a map within 90 secs means your HDD is too slow. You could try defragmenting your current hdd or buying a new ssd/hdd.
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