The new 17.10.9 patch might fix this for you:   New MX 17.10.9 stable firmware release - IDS/IPS CPU utilization fix! (and ... - The Meraki Community ... View more

I guess they went ahead and released 17.10.2 anyway and I'm having the same issue at two of my client sites. Sigh. MX64W: LAN is fine, wifi is trash. ... View more

I am removing our whitelisted rule tomorrow, I don't expect any issues. ... View more