For comparison larfs:
MiG-21 Fishbed:
Max takeoff weight 10,400 kg (22,928 lb), 40.18 kN (9,030 lbf) thrust dry, 69.58 kN (15,640 lbf) with afterburner
Maximum speed: Mach 2.05
Combat range: 604 km (375 mi; 326 nmi)
Ferry range: 660 km (410 mi, 360 nmi)
Dassault Mirage III:
Max takeoff weight 13,700 kg (30,203 lb), 41.97 kN (9,440 lbf) thrust dry, 60.8 kN (13,700 lbf) with afterburner
Maximum speed: Mach 2.2
Combat range: 1,200 km (750 mi, 650 nmi)
Ferry range: 3,335 km (2,072 mi, 1,801 nmi)
Lockheed F-104 Starfighter:
Max takeoff weight 13,166 kg (29,027 lb), 10,000 lbf (44 kN) thrust dry, 15,600 lbf (69 kN) with afterburner
Maximum speed: Mach 2.2
Combat range: 420 mi (680 km, 360 nmi)
Ferry range: 1,630 mi (2,620 km, 1,420 nmi)
EE Lightning:
Max takeoff weight 20,752 kg (45,750 lb), 12,690 lbf (56.4 kN) thrust each dry, 16,360 lbf (72.8 kN) with afterburner (x2)
Maximum speed: Mach 2.27
Combat range: 135 nmi (155 mi, 250 km)
Ferry range: 800 nmi (920 mi, 1,500 km)
So a smidge faster than a Fishbed, for something twice the size. I think the combat range is unfair - I believe it's assumed to run full afterburn the whole way - so that's why I included the ferry range.
So big, short legs, brutal acceleration but top speed not any different to anything else and not carrying anything like the loadout or radar of a Phantom. Though the Phantom introduces a whole new "Lawd he's a comin'" category to "fat" in fighters.
Like a lot of things developed back then, its main purpose - intercepting Soviet bombers - became obsolete fairly early on in its career. But unlike the Mirage or the Fishbed, the Lightning wasn't a very good platform to build alternative capabilities onto. It was more like the Starfighter in that regard - sure there was a ground attack variant sold to foreigners, but it sucked and crashed as often as not. Meanwhile the French sold well over 1,000 Mirages and the Israelis still have some heavily modified ones in use.