Hampshire took total control by stumps on day two of their LV= County Championship Division Two match against Essex.
The hosts lead by 429 runs, with eight second-innings wickets remaining at the Ageas Bowl.
A five-wicket haul by South Africa Test pace bowler Kyle Abbott, followed by a third championship century of the season by James Vince, pointed Hampshire towards a fourth victory.
Essex, who began the second day 55 for two, losing seven wickets for only 23 runs in a catastrophic 45-minute spell in the morning session.
They plummeted from 69 for two to 92 for nine before last pair Reece Topley and Tymal Mills rallied to leave Essex 121 all out.
Hampshire, 165 runs ahead, chose not to enforce the follow-on and, with Vince hitting a superb unbeaten 154, moved to 264 for two at the close.
— Hampshire Cricket (@hantscricket) June 16, 2014
The hosts totally dominated the day, initially with their pace attack then third-wicket pair Vince and Will Smith, who shared an unbroken partnership of 240 as Hampshire marched purposefully on to 264 for two.
The morning session belonged entirely to Hampshire's three-pronged pace attack of Abbott, left-armer James Tomlinson and Matt Coles, who ripped through the Essex batting line-up.
Overnight pair James Foster and Nick Browne successfully negotiated the opening seven overs before Abbott broke their 67-run partnership - which had begun with Essex two for two after only 14 balls the previous evening.
Foster added 10 runs to his overnight score before being well caught for 36 by Coles, diving to his left at backward point, to give Abbott his second wicket.
Bowling at pace and extracting movement off the surface, Abbott struck twice more with the Essex total tottering on 69.
He had New Zealand Test batsman Jesse Ryder picked up at third slip by Smith and then bowled Ben Foakes second ball.
Essex had lost three wickets in the space of 13 deliveries, all to Abbott, and were 69 for five.
Another cluster of wickets fell from 85 onwards with Coles having Ryan ten Doeschate caught at slip by Vince, Tomlinson trapping opener Nick Browne lbw for a first-class best 31, and David Masters picked up bat-pad by Adam Wheater.
That was 89 for eight and it became 92 for nine when Vince climbed high at second slip to remove Monty Panesar and reward Tomlinson with final figures of three for 25.
Tail-end pair Topley and Mills, who made 12 and nine not out respectively, frustrated Hampshire for almost an hour before Abbott completed his five-wicket haul, bowling the obdurate Topley.
Abbott finished with figures of five for 44, a return which took his County Championship wicket tally for the summer to 32, while Coles took two for 23.
Trailing by 165 on first innings, Essex struck two early blows – Ravi Bopara diving at midwicket to catch Michael Carberry and then bowling Jimmy Adams to leave Hampshire 24 for two in the 12th over.
That was the last taste of success Essex were to enjoy as Hampshire totally dominated the remainder of the second day's play, with Vince and Smith creating a new record third-wicket partnership of 240 for the county against Essex.
Loose at first, Vince batted majestically, underlining his growing England potential with an unbeaten innings of quality.
He struck 21 boundaries in making an undefeated 154, completing his 13th first class century and moving towards bettering a career-best 180 against Yorkshire in 2010.
Smith was the perfect partner, scoring a sedate 78 not out as the pair took Hampshire's second innings total to 264 or two – a lead of 429 – by stumps.