Xs max jailbroken download so slow from Appstore? Why?

Hello i had this phone from my wife xs max she was not using phone with jailbreak, i got this phone and made jailbroken. Then first days i use there was not any problem. Then i don’t know what happened my download speed is so slow now i tried to download 2-3 apps i put it tonight until morning 1 app still did not finish download yet. Phone : Xs max 512 version : 12.1.2 i tried re-jailbreak , restore rootfs , i deleted all tweaks and reinstall jailbreak, logout and relog appstore . I don’t know what else should i do .. please help me. by the way i use speedtest app it gives me high speeds. Also i am trying 4g lte internet still nothing change. Also i tried download without jailbreak it is still same ..

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