You buy the computer when you need the computer. No one buys (or no one with any sense) a computer today if they won't be turning it on for a year.
In an inflationary economy you are motivated to spend the money early, rather than late. And as buyers predominantly drive the economy and not sellers, this keeps things moving at a reasonable tempo (barring extreme inflation).
In a deflationary economy you are motivated to spend the money later. And, again, as buyers drive the economy more than sellers, this slows the pace of the economy. [0]
Right now it is to my benefit to buy a house for $200k and secure a $180k loan at 3% interest because with inflation the real interest rate is actually more like 1% (assuming the target of about 2% inflation per year).
In a deflationary economy that $180k loan at 3% would have a real interest rate closer to 5%.
The lender comes out great, they still get their 3% interest and the effect of deflation. The borrower gets shafted, they're paying back much more than the property is worth by the end of the loan (even worse than under inflation).
However, while buyers get to drive much of the economy compared to sellers, lenders have control of the capital and are in a better position to set the terms than borrowers. So under deflation buyers are doing fine, lenders are doing better than now, sellers are meh, and borrowers are screwed.
[0] Why I say buyers drive an economy more: It is very difficult for seller to force a sale. The buyer almost always has a choice. Now, the seller can set the price but as they want to remain profitable they can only push it so high before they lose sales to competitors who recognize the opportunity to undercut and remain profitable.