The word "So" used to refer back to an idea, action, quality, situation etc that has just been mentioned, "So" also used to add that what has just been said is also trueabout someone or something else.
These are some useful examples:
‘Will I need my umbrella?’ ‘I don’t think so.’ If you want to go home, just say so. The band is popular and likely to become more so. Jerry is very honest, perhaps too much so. The troops will not advance until ordered to do so. Did Luke sell them? And, if so, what happened to the money? ‘Has he lost a fortune?’ ‘So they say.’ ‘Look – I’ve even cleaned the windows.’ ‘So I see.’ Parents can withdraw their child from school if they so wish.
و لذا ترجمه متن شما بدین شرح است:
" این بخاطر سرعت و نیز اهمیت [این کار] است."
" این از جهت سرعت و همچنین ارزش [این کار] است."