DESPITE HIS COMPLAINTS; SF34 FO REPORTS CAPTAIN FALSIFIED PAX WEIGHTS AND PRESENCE OF JUMPSEAT RIDER IN ORDER TO MAXIMIZE PAYLOAD. MARGINAL CLIMB PERFORMANCE RESULTS.

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OUR FLT DEPARTING ZZZ WAS TOO HVY ACCORDING TO THE LOAD MANIFEST. THE CAPT DECIDED TO CHANGE THE COUNT OF 3 ADULTS TO CHILDREN IN ORDER TO TAKE EVERYONE ON THE FLT. AFTERWARD; A JUMPSEAT OCCUPANT WISHED TO BOARD. IN ORDER TO ACCOMMODATE THE JUMPSEAT OCCUPANT AND ALL OF THE PAX; THE CAPT DID NOT INCLUDE THE JUMPSEAT OCCUPANT IN THE LOAD MANIFEST. THIS MADE OUR CALCULATIONS ALMOST 500 LBS LIGHTER THAN WE ACTUALLY WERE. FURTHERMORE; WE WERE FLYING WITH A DERIVATIVE ENG. THE TEMP WAS WARMER THAN STANDARD; THE PRESSURE WAS LOWER THAN STANDARD; AND THERE WAS MODERATE CONVECTION AND WINDSHEAR IN THE VICINITY. I WAS THE FO; AND I STATED MY OBJECTION TO DEPARTING THIS WAY PRIOR TO PUSHING OFF OF THE GATE; BUT THE CAPT TOLD ME TO DO WHAT HE SAID OR HE WOULD HAVE ME DISCIPLINED BY THE CHIEF PLT FOR INSUBORDINATION. WHILE I DISAGREED WITH OUR OVER MAX GROSS WT DEP; I FOLLOWED MY CAPT'S ORDERS AND ALLOWED THE FLT TO DEPART WITH THE FALSE MANIFEST ON FILE WITH THE GATE. WE EXPERIENCED POORER THAN NORMAL CLB PERFORMANCE. SINCE I WAS FLYING THE LEG; I NOTICED THAT OUR CLB PERFORMANCE WAS FLUCTUATING BTWN 100 AND 600 FPM. NEW YORK DEP ASKED US TWICE TO INCREASE OUR RATE OF CLB DURING OUR CLB UP TO 10000 FT; BUT WE WERE UNABLE TO COMPLY. THE CAPT NOTICED THAT I HAD ATTEMPTED TO INCREASE AIRSPD FROM 150 KIAS TO 180 KIAS. (I THOUGHT THAT IF WE HAD MORE AIRSPD; THEN THE CLB WOULD BE BETTER.) HOWEVER; THE CAPT KEPT SAYING TO MAINTAIN 150 KIAS; WHICH GAVE US THE POOR CLB PERFORMANCE. WHEN I TRIED TO EXPLAIN MY THEORY TO THE CAPT ABOUT THE HIGHER AIRSPD CREATING MORE LIFT; HE CUT ME OFF AND SAID; 'SHUT UP AND DO WHAT I SAY!' I THEN OFFERED TO HAND THE CTLS OFF TO HIM; BUT HE REFUSED TO TAKE THE CTLS AND INSISTED THAT I CONTINUE THE SLOW CLB ACCORDING TO HIS INSTRUCTIONS. I DECIDED THAT I DID NOT WANT TO ARGUE WITH MY CAPT ANYMORE THAN I ALREADY HAD IN THE PRESENCE OF A JUMPSEAT OCCUPANT; SO I DISCONTINUED EXPRESSING MY CONCERNS FOR THE REMAINDER OF THE FLT. THIS CAPT FEELS THAT HE CAN SAFELY OVERLOAD THE ACFT AND EXCEED ITS LIMITATIONS WITHOUT CONSEQUENCE. IN HINDSIGHT; I FAILED TO EXERCISE MY AUTH AS A FO BY ALLOWING THE FLT TO DEPART OVERWT. I FAILED TO EXERCISE MY AUTH AS THE FO BY NOT REFUSING TO FLY WITH A FALSE LOAD MANIFEST; HOWEVER; I WAS INTIMIDATED BY THE CAPT TO DO SO. I HAVE EXPRESSED MY CONCERNS TO THE FAA CONCERNING THIS FLT. HOWEVER; I HAVE FILED THIS ASRS RPT CONCERNING MY INVOLVEMENT IN THIS MATTER.