I know that expo app size is bigger than native, and i think that its fine for me, but does expo app size affects perforrmance too? making it slower than react-native cli? im having a crisis 
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No, I don’t believe app size would have any noticeable effect on performance
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If you are measuring startup performance, the size of the javascript bundle does make a difference. However, the native libraries baked into Expo, accounts for the bulk of the size of the app and shouldn’t affect performance much.
We have found startup times to be somewhat delayed compared to pure react native, but it is understandable as a lot more is going on on startup, not the least of which is the awesome update mechanism.
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