It's not clear how tight the connection is, what passport you have, whether or not you are eligible for fast track, and how bad the missed connection would be for you. Sometimes, it is just waiting an hour or two for the next flight, sometimes it means missing a critical meeting and staying at a hotel overnight.

Without knowing that much about what you are facing, two options might be worthy of consideration is using the Malpensa VIP service. In addition to other services that you probably won't need, they will fast track you through security and passport control, and sometimes take you to the plane in a private vehicle, rather than waiting for a bus.

There is also a service at MXP called ViaMilano. If you don't have Fast Track, you can purchase it from them, and depending on your specific condition, might be eligible to get it for free. If you have a legal connection and miss your flight, they will insure it for free by booking you on another flight with much less hassle than doing it on your own. Depending on your situation, they will reimburse you for taxis, meals, hotels, extra costs due to re-routing, or even refund your ticket if that is what you need. Most of their services are free, provided by the Milan Airport Authority (both Malpensa and Linate).

Depending on your circumstances, you might want to look at MXP VIP services, and ViaMilano, to see if they may suit you.