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Editorial Team
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Asked: 2026-05-14T00:57:45+00:00

I am working on an image generation script in PHP and have gotten it

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I am working on an image generation script in PHP and have gotten it working two ways. One way is slow but uses a limited amount of memory, the second is much faster, but uses 6x the memory . There is no leakage in either script (as far as I can tell).

In a limited benchmark, here is how they performed:

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METHOD  | TOTAL TIME | PEAK MEMORY |  IMAGES
--------------------------------------------
One     |     65.626 |     540,036 |     200
Two     |     20.207 |   3,269,600 |     200
--------------------------------------------

And here is the average of the previous numbers (if you don’t want to do your own math):

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METHOD  | TOTAL TIME | PEAK MEMORY |  IMAGES
--------------------------------------------
One     |      0.328 |     540,036 |       1
Two     |      0.101 |   3,269,600 |       1
--------------------------------------------

Which method should I use and why?

I anticipate this being used by a high volume of users, with each user making 10-20 requests to this script during a normal visit.

I am leaning toward the faster method because though it uses more memory, it is for a 1/3 of the time and would reduce the number of concurrent requests.

Update: I was able to refine the second option and come up with a third that cut the memory usage almost in half. Running the new numbers one after the other, this is the new benchmark:

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METHOD  | TOTAL TIME | PEAK MEMORY |  IMAGES
--------------------------------------------
One     |     51.901 |     798,900 |     200
Two     |     12.039 |   3,269,600 |     200
Three   |     13.667 |   1,815,624 |     200
--------------------------------------------

Thanks for the direction and help!

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1 Answer

  1. Editorial Team

    I’d go with the second. It’s faster, which is always good for the end-user. The ram usage is high, though, so you have to weigh in the price of additional ram. It’s easier (and cheaper) to add ram to a server than it is to add a whole new box.

    On the other hand, have you profiled both of these? I’m sure you can reach some kind of happy middleground. Something like the speed of the second algorithm but the memory usage of the first. Run it through xdebug before you make a decision.

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