EIZO's FlexScan EV2785 is an excellent 27" office monitor. It is equipped with a high-quality 4K IPS panel that's been carefully factory-calibrated, and a USB-C port, which turns it into an attractive proposition for everyone who owns a USB-C laptop, since the monitor can be used not only to expand the desktop, but also to conveniently charge the battery and connect peripherals.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips