Smooth painting at Full-HD ($350-$620)
The DeskMini PC box is only 15 x 15 x 8 cm, with the power brick 1/6 of the box size. Total hardware cost the main unit (i.e. excluding monitor, mouse and keyboard) is USD380. Depending on how you get a license for Windows OS, the final cost could be sub-$400. There are also ready-to-use pre-built units available at e.g. Amazon at around $620 (OS included) for those of you who don't want to build a PC yourselves.
Thanks to AMD for making great performing APU at affordable price, and Asrock for making such a compact box!
Smooth painting at 4K+, as an upgrade (+$116 + Graphics card of your choice)
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Smooth Painting At 4K+, Compact, ready-to-use ($1150-$1300)
Other ready-to-use mini PC's with Radeon RX Vega M GH GPU (but not as tiny as the Intel NUC) include this Beelink Kaby G7 (with 16GB RAM + 256 GB SSD at $1150) and the HiGame from Chuwi at $1300.
Conclusion? You don't need a huge PC to run Expresii fast! ╭( ･ㅂ･)و ̑̑