Although hardware acceleration seems to be enabled in the options:
Tools ▸ Options ▸ LibreOffice ▸ View
it does not seem active in practice: Calc is extremely slow, even when switching cells with the arrows and there are large black artifacts in the window from time to time in Writer.
Under linux ARM, some programs support hardware acceleration (chromium, firefox …) others seem not to support it (LibreOffice, Gimp…).
Call for comments on LibreOffice bugs tracker. Please, confirm or unconfirm the bug.
Same problem than Pinebook pro hardware acceleration ?