'Why does APK with the same size take different times to install?

I'm developing an app store and in that store there are two apps:

When installing these apps on my device, I have the following result:

This installation time only, disregarding the download time.

I would like to understand the possible causes that make the first app install much faster than the second, even though it is bigger.

can you help me?

Thanks in advance.

android performance apk

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