Purchases.shared.getCustomerInfo too slow.

Users have reported and proved active subscriptions. Only they are presented with the paywall. 

here is my code to check their status 

1static func isPremiumSubscriber() -> Bool {
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3var subscribed = false
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5 Purchases.shared.getCustomerInfo { customerInfo, error in
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7
8//this is too slow as subscribed is not updated to the result of 
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10//!customerInfo!.entitlements.active.isEmpty
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12//before function is returned with the initial value of false for subscribed.
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16     subscribed = !customerInfo!.entitlements.active.isEmpty 
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18
19}
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21return subscribed 
22}