In the web framework world, libraries are moving from a react component style of authoring to an older knockout based model. This means, instead of rendering an entire block of HTMl on each render pass, just a minimal subset will be rerendered, as the variable is bound to specific DOM elements. This effort started with Knockout, fell out of favor, and saw a resurgence with the success of SolidJS. Svelte has started moving in this direction. It's my opinion that React's compiler will eventually serve the same purpose to allow their giant user base to get the same benefits.
In the web performance space, there's some interesting stuff happening in origin trails around shared dictionary compression. It has been tried and failed before but the latest iteration/spec hopefully improved those shortfalls that made them unusable. Also, ZSTD compression has taken the crown from brotli.
Metas new AR glasses seem to be approaching the ideal hardware, IMO it's still searching for its killer app. Microsoft exited the AR space by killing hololens.
Startup space is dying right now, with very low VC risk tolerance / interest. Some funds have returned money to investors rather than risk it in investing.