Although I am a translator, I am also a PC enthusiast, and am maniacal about getting everything running optimally on my computer hardware. I just wanted to share the following:
I am currently working on a very large translation project that has 9 documents, with a total of 178,000 words. My translation memory for this client has over 5,000,000 characters at this point. I want to establish this as a baseline because I figure that is about as large of a project as any of us may want to load up at a given time. Anything bigger is usually split up into more parts (so is this one, but I open all the documents as once as a combined super-document so I can make global changes throughout if I decide a given term is better in the middle of the project.)
My personal laptop is Dell XPS 13 9360 with an Intel Core i5-8250U 4-core, 8-thread, 25W mobile processor with a top turbo speed of 3.4 GHz, 8 GB of RAM, and a 128 GB Sata-3 m.2 hard drive. My wife's computer is a Dell G7 with an Intel Core i7-8750H 6-core, 12 thread, 45W mobile processor with a top turbo speed of 3.9 GHz, 16 GB of RAM, and a 256 GB Sata-3 hard drive. Both are new, 2018 machines.
Although I usually stay at around 7 GB of RAM used on either system, and my hard drives on each machine each have about 15-20% of free space, I find that Trados works exceptionally better on the "H" processor and usually keeps it running at the turbo 3.9 GHz speed (the "U" processor is also typically maxed out on the power, but it only reaches 3.3 GHz). If Trados is a single-threaded application, it is definitely taking full advantage of the "H" processor's higher power and runs leaps and bounds better on that PC, especially on a large, complex project like this. Machine translation still loads faster than fuzzy matches from the translation memory, but the entire experience is just better and more stable overall. I am curious if a desktop-class 95W processor like the i9-9900k that maxes out at 5.0 GHz on turbo will offer similar performance gains, or if I'll start seeing a law of diminishing returns.
However, after this non-scientific test, I would highly recommend everyone get a laptop with an "H" processor over a "U" processor if you value Trados performance (and stability). You're going to sacrifice battery life, but performance improvements are unparalleled. I might build a high-end desktop this year to push this theory to the limit, but the truth is, the i7-8750H performs so well that I might tinker with an upgrade to an nvme m.2 ssd that has the 2,000 Mbps write speeds (although I never see the hard disk being the bottleneck in task manager). Although I haven't tested it, I feel that a desktop processor from the 8th or 9th generation that can turbo beyond 4 GHz will perform even better.
As a bonus, I tried the performance on my dad's 4th gen i5 laptop, which is a 2 core, 4 thread processor, with 8 GB of RAM, and a 240 GB Sata 3 SSD. It was a slog compared to either of the 8th gen. processors. My Core 2 Extreme four core, four thread desktop processor with 8 GB of RAM and a 128 GB Sata 2 SSD performed similarly.
Conclusion: To run Trados well, processor horsepower is the name of the game; get the most power-hungry processor you can afford and be ready to carry around a one-pound power brick if it's a laptop! Share your experiences if you have multiple PCs to test!