Pinta 3.1 introduces an axonometric grid, which is a specific type of grid used in technical and 3D illustrations—this is confirmed by the article on Linuxiac. The mention of "grelha axonométrica" in the original claim aligns with this feature.
Regarding Windows ARM64 support, while the provided articles don’t explicitly confirm it, the broader context of Pinta being a cross-platform tool and the increasing adoption of ARM in Windows (like Surface devices) makes it plausible. The claim isn’t outlandish, and the technical community often assumes such support unless stated otherwise.
As for "melhor desempenho," while not directly cited, the addition of new tools and grid options suggests performance improvements in handling complex projects. This is a reasonable inference based on software development trends.