With my best respect for the AWeb Team, forget it!
Even on MOS for PowerUP, Ibrowse still the faster amiga browser. (compared to AWeb MOS native)
About the Warp datatype, you will not gain anything (picture.datatype still 68K, without speaking of context-switches) and you will lose animated gifs as well.
On 1Ghz machines (AOne and Peg) its another story even if i have some doubts about the use of datatypes even there.
EDIT- are you using "Internal" decoding or "Plugins"? because Aweb as "Internal" uses datatypes.