Lag in the text viewer

[easyaspi314]

Device: LG G3 D851 CPU: Qualcomm Snapdragon 801, quad core, ARMv7a, 2.4 GHz, underclocked to 1.7 GHz GPU: Adreno 330, 462 MHz OS: LineageOS 16.0 (Android 9.0), also LineageOS 15.1 (Android 8.1) FastHub-Libre version: 4.6.7 from F-Droid

Scrolling in the browser (e.g. when looking at a source file) has serious lag problems. It takes a few seconds to load a relatively small source file, often locking up entirely for a few seconds before scrolling.