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 Spring's decryption is in native code, I didn't measure the performance but from your description of the issue I'd say it's probably js-specific problem. 
 That’s good to know. Is there a way for client devs to debug inside Spring? 
 Not really, unfortunately. You'd have to use mobile Chrome and connect it to desktop dev console to debug properly. Spring only shows logs on the About page, and even those aren't convenient at all.