Yes+No ("Jein" in German) - custom silicon is made for precisely defined algorithms - e. g. calculating beams of a multi-directional radio antenna or encrypt/decrypt messages or make numerical simulations on environmental settings. (Few formulas, lots of data).
Web browsing, in contrast, means (nowadays) executing any arbitrary JS program which all those guys put onto the web. /If/ you wanted that more efficient, /they/ should program the app directly in C/C++/...
A Plan 9 oriented server.