Couple of thoughts. The MX64 will only do 200Mbps if you’ve got all the threat protection switched on - although I wouldn’t call that a crawl. Will your ISP A (fibre) provide you with multiple IP addresses? Maybe they only allow a single address and it is jumping between the HA MXs. Both MXs need to have IP addresses (and you have an option to have a third, VIP, if you want to).
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