You with all your 21st century computers and communications

I heard that the capacity of the apollo 11 computer was equivalent to the size of a modest jpeg image, so it was not very powerful.

It's hard to make a perfect analogy because it was it's own thing. But memory and computation power of the Apollo 11 guidance computer was more powerful than a graphing calculator but less powerful than the first crop of 8-bit home computers like Apple II and Pet. Limited but it was engineered for the specific job and got it done.