[longstation]

My guess is probably the QuickJS has less resource usage compared to the more performant V8.

UPDATE: Now I have read the linked article, here is the reasons (copied from the article):

API and integration principles are close to what TIScript uses – it took me just 1 month to add QuickJS to Sciter core. And 4 months more to expose HTML/CSS runtime to JS.

Relatively compact implementation – QuickJS is slightly more fatty (by 100 kb) but still in acceptable range. For the note: full version of V8 is about 40 mb – 5 times larger than Sciter itself;

Liberal MIT license. Sciter cannot use GPL/LGPL code – many customers expressed this requirement;

Readable source code. Well… almost readable.