Many of us spend substantial periods of time writing up the technical documentation in Confluence or use JIRA. Confluence alone loads approximately 22Mb of mangled and compacted JavaScript for each open page in a separate browser tab.

Before M1, Confluence and JIRA were the single most source of a sustained battery drain, irrespective of the browser. On M1 based laptops, the battery impact is so negligible that it can be considered non-existent. How much of this subjected experience can be attributed just to the the ARM 8.3 JavaScript hardware acceleration is an interesting question as the JavaScript browser performance on Intel CPU's has also been affected by Spectre and Meltdown mitigations in the CPU microcode.