I don't know the terrain where you are, but unless it's relatively flat, you're going to be working a lot harder with the gearing on that Tarmac.
Your Trek hybrid probably has a wide range cassette on the back, and either a triple chain ring, or a compact double ring, on the front. A wide range cassette usually has the biggest gear cog in the back with somewhere between 28 and 32 teeth, sometimes as many as 34 or 36. More teeth in the back, the easier it is to turn that gear. The opposite is true of the front rings. The smaller one is easier to turn. Your small (or smallest for a triple) front/biggest rear is what's called your "granny" or bail out gear. Let's say that your Trek has a 50/34 compact double, the big ring with 50 teeth, and the small ring with 34. And that your cassette has a 32 tooth largest gear. The gear ratio of your small front/big rear is 34 divided by 32. 1.06 gear ratio. On the Tarmac, your small front/rear big is 39 divided by 23. That's 1.77. You'd be working almost twice as hard to climb a steep hill.
The good news about all of this is that it takes a bike shop about 5 minutes to change a cassette, and it's easy to learn how to do this yourself. If you were to buy a new 10 speed cassette (and 10 speed Ultegra cassettes are almost as good as Dura Ace and way cheaper) that had a 12-27 range, you'd probably work a lot less hard and be able to go just as fast. I'm not saying, don't buy the bike. Just think about swapping out the rear gears. Pros ride 53/39 cranks with an 11-21 cassette on flat stages of the Tour de France. An 11-23 is the next step up, and some would ride a bigger one than that on climbing stages.