The response speed of a sensor is an important feature that one should consider when specifying a sensor for an application, especially if that application involves high speed movement like many of today's manufacturing processes. However, it's very easy to overestimate what you really need based a perceived notion that a process is "ultra-fast".
A temperature controller is a device that you can employ to provide a consistent temperature in your process. Panasonic temperature controllers have a PID function to calculate an appropriate counter response to fluctuations in the process.