I am experiencing delays in updating backups to iCloud, macBook when plugging my iPad mini 3 to MacBook Air through USB/Lightning port. The ports work fine, the cables have been checked, so no hardware issues. AppleCare suggested that I use a vetted Apple-approved anti malware software, but I told tech that Bitdefender Total Security 2019 includes malware protection. Tech suggests that perhaps Bitdefender is creating an issue, and that I turn OFF Bitdefender Shield when I backup to iCloud or to MacBook through iTunes. This seems to be an unnecessary and potentially dangerous suggestion, so I am asking for advice. I am running macOS Mojave 10.14.5 (18F132).