In my tests any twin engined fighter-bomber will handle its ordnance substantially better than a single engined fighter. It is most noticeable in climb, but even speed on the deck shows it.
Speeds at SL:
P-47N, 50% fuel:
Clean MIL: 327mph
Clean WEP: 366mph
Laden MIL : 277mph
Laden WEP: 316mph
P-51D, 50% fuel:
Clean MIL: 355mph
Clean WEP: 368mph
Laden MIL : 304mph
Laden WEP: 315mph
F4U-1D, 100% fuel:
Clean MIL: 342mph
Clean WEP: 356mph
Laden MIL : 294mph
Laden WEP: 308mph
P-38L, 75% fuel:
Clean MIL: 333mph
Clean WEP: 345mph
Laden MIL : 299mph
Laden WEP: 314mph
Mosquito Mk VI, 50% fuel:
Clean MIL: 320mph
Clean WEP: 357mph
Laden (four 500lb) MIL : 308mph
Laden (four 500lb) WEP: 343mph
Laden (two 500lb & eight 60lb) MIL : 300mph
Laden (two 500lb & eight 60lb) WEP: 333mph
Bf110G-2, 75% fuel:
Clean MIL: 311mph
Clean WEP: 322mph
Laden MIL : 298mph
Laden WEP: 309mph