The scene where Blofeld (off screen) describes how Asian Fighting Fish pick off their tired opponents, and how he compares them to how SPECTRE operates.
Kronsteen's death. Even though he dies in 12 seconds, it seems like an eternity.
For that matter, Rosa Klebb's death near the end of the movie. After getting shot, she gives off a death wail, before slowly crumpling to the ground for like a minute and a half, mouth still open in pain. And all of this is on-screen.
"Red" Grant in general. There has never been a more stone-cold, implacable, utterly evil psychopath in the entire Bond series. The man's like a blond Anton Chigurh. Every time he shows up from about 24 minutes in (when Bond arrives in Istanbul), someone dies.