If you get your visa it would be advisable to take the time to go to Canada and complete the landing formalities. If you do that, you are allowed to stay outside Canada up to 3 years in every 5 without losing your PR.
If you let the visa expire without using it, you will have to apply from scratch again. It will not be faster or easier.
If you let the visa expire without using it, you will have to apply from scratch again. It will not be faster or easier.