The phrase "a speed with which" is correct and usable in written English.
It can be used to describe the manner or rate at which something occurs or is done.
Example: "The athlete demonstrated a speed with which few could keep up during the race."
Alternatives: "a pace at which" or "a rate at which".
Gunfights, quite literally, proceed only at a speed with which the player is comfortable.
Clients aren't rushed in and out with some kind of identi-cut; appointments proceed at a speed with which the client is comfortable and the styling process is defined by collaboration.
Pick a rope that has a speed with which you are comfortable.
This suggests that there may be an optimal tilt angle, for a given speed, with which to achieve the maximum mixed cross sectional area within a minimum amount of elapsed time.
Then again I don't know if there's a human speed with which you can successfully operate against this defense.
The Doppler technique used by the search team sees this wobble as a change in the speed with which a star moves toward or away from us.
The problems at Portsmouth, the details of which even now seem scarcely believable, gave Brown an insight into the speed with which a club can lose control and an understanding of the power of collective action.
As a result, the speed with which companies were back in business after the attacks depended largely on how fast workers were relocated, not on the availability of their mainframe computer data.
As a result, the speed with which these mortgages were bought and sold left the actual chain of ownership to many of these homes in question.
In an expanding universe, the speed with which a galaxy flies away from us is proportional to its distance.
I then discuss an example of the speed with which a new product may be adopted once approved and suggest improvements to drug safety surveillance systems.
