Odd arm64 vs x86_64 performance

I’m using a Windows 11 arm VM on my M3 MacBook Air for some work, and I have installed LibreOffice inside it to quickly edit some xlsx files without bothering to copy files in and out of the VM

Since it’s Arm, I made sure to download the aarch64 build. However I quickly realized that Calc has terrible performance, taking a few seconds to load the UI, and horribly lagging when scrolling through a large sheet

Just on a whim, I removed the Arm build and installed the x86_64 build, to see that none of these issues are present in that build. Calc runs very smoothly with all the large sheets I can throw at it

Now this isn’t a big deal since I have a solution, but I have trouble comprehending how this can happen. Shouldn’t the aarch64 build inherently have better performance? (aarch64 builds of other apps such as Firefox run fine)

LibreOffice version: 24.8.4.2
OS: Windows 11 24H2 on Arm
VM: VMware Fusion 13.6, 6 vCPUs, 10 GB RAM
Host: 2024 M3 MacBook Air 15", macOS Sonoma

Cross posted on Reddit.

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