[Windows Central Question]

if you simple check the Whatsapp it is double in size than the apps in Andriod store.

is not this a issue. it is eating too much of internal memory

[a5cent]

If true, then the app will occupy more space in storage (internal or SD card). There is however no direct relationship between file size and RAM usage. You can't tell, just by looking at file size, how much memory will be required.

[Funky Cricket]

I think by "internal memory" the OP meant "onboard storage". a developer would need to answer that question. it may be more dlls need to be packaged with the application as they can't be shared due to security.

[babula pradhan]

i got that WhatsApp is a third party apps we cannot see there dlls. it is not only WhatsApp i found many apps,