If you're really shooting high volume, the press is only part of the process. I know some people skip steps and that's their choice. Presses don't clean and prep brass, and those processes can take as much time or more than loading if you don't have the right equipment -- that is equipment that can handle larger batches. The fact is most tumblers sold for reloading, wet or dry, cannot handle 1000 cases at a time. Some of them inflate their case capacity by making capacity claims that exclude media. I could easily spend more than a thousand dollars on a high-end progressive setup, but it won't speed me up if I can't feed it cleaned and prepped brass fast enough. What's good about brass cleaning and preparation is it is generally a less costly process to cut time. For cleaning, you need larger containers which don't cost significantly more than smaller ones. It can be more costly if you choose to buy multiple cleaners. For prep, you can speed up some processes with a motor.
Another important time saver is having enough brass. If you're cleaning, prepping and loading the same 100 cases over and over again it will get tedious. It's a lot easier when you've shot a thousand cases and you already have another thousand cleaned, prepped, and ready to go. But again, that means having the machines to process thousands of cases instead of a few hundred at most.
Speed on a progressive press is really dependent on all the necessary preparation being done beforehand. The most sophisticated (and costly) progressive presses need less preparation as more processes are included (successfully) in the press's operation. Those operations can include case collating and feeding, priming, and more die stations for optional dies like bulge busters, powder checkers, separate crimp dies, and so on. Press operation can also include cartridge changeover. Costlier setups can make that process faster while simpler configurations will require more involved and time-consuming changeovers.
I use a Lee Auto Breech Lock Pro. I like it but it has its limitations. It will reload handgun cartridges (up to 500 S&W) and .223, 6.5 Grendel, 7.62x39 but not longer rifle cartridges like .308 or the Creedmoors etc. I use it with a case feeder (but no collator). I gave up on the bullet feeder and I also don't use the on-press primer. If I am able to feed it with clean, primed cases (which I also prefer to be resized when I decap them, though it can resize during the loading process as well), then I can load at least 400 rounds per hour. I loaded just under 5000 cases last year. I also used a LCT last year and I found the ABLP to be faster with fewer pulls and probably most importantly, less loading and unloading of cases (the case feeder makes a big difference). I don't consider the ABLP in the same league as the best progressive presses, but it can do a good job loading cases if you're reasonably clever to work out the process. It's not for the person who wants the process to work flawlessly without fail. If you learn to work around its shortcomings, the biggest challenge will be having enough prepared brass, bullets, and powder on hand to keep it going. I'm satisfied with the ABLP and intend to run it for as many as 12,000 cartridges per year. I think it's a good fit for that volume, but some people are happy to load the same on a LCT or single stage. Others load more than that every month, and I can't say I recommend it for that.