FOREIGN AIR CARRIER IS SLOW IN CLRING THE RWY CAUSING RPTING ACFT TO LAND WHEN OTHER ACFT HAD NOT YET CLRED.

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UPON HDOF FROM ZMA TO MIA APCH; APCH GAVE US A HDG TO JOIN RWY 30 LOC. WE DEVIATED AROUND SEVERAL LEVEL 2-4 TSTMS ALONG LOC COURSE. APCH ASKED US TO SAY AIRSPD OF 200 KTS AND MAINTAIN THAT SPD. WE WERE ADVISED THAT WE WERE IN TRAIL OF A 757 INBOUND TO MIA. APCH ADVISED 757 TO KEEP SPD UP AT APPROX 6-7 NM FROM ARPT. WE ACQUIRED A VISUAL ON RWY 30. WE WERE ASKED TO SLOW TO 190 KTS THEN 170 KTS BECAUSE 757 SLOWED TO 140 KTS. THE SPACING ON OUR TCASII SHOWED US 2 1/2 - 3 NM IN TRAIL. THE CTLR ADVISED 757 TO PICK THE SPD UP -- THE RESPONSE WAS IN BROKEN ENGLISH. UPON HDOF TO TWR; I MAINTAINED A HIGHER THAN NORMAL GLIDE PATH TO STAY ABOVE THE 757 WAKE. THE 757 LANDED LONG APPROX 3000-3500 FT DOWN THE RWY. THE TWR ADVISED THEM TO EXPEDITE OFF THE RWY. THE 757 ONLY SLOWED TO A CRAWL AND TAXIED THE LAST 1500 FT; NOT USING A TXWY HE COULD HAVE USED. HE CRAWLED TO THE VERY END AND SLOWED TO VREF APPROX 2 1/2 NM AND MAINTAINED TRYING TO GIVE HIM THE SPACING. THE TWR TOLD US WE WERE STILL CLRED TO LAND. I CONTINUED AND LANDED. THE TAIL OF THE 757'S ACFT APPEARED TO POSSIBLY STILL BE OVER THE RWY EDGE BOUNDARY MARKING! I RECOMMEND THAT THE S AMERICAN AIR CARRIERS TEACH THEIR PLTS BETTER ENGLISH SPEAKING SKILLS. THIS IS NOT THE FIRST TIME I'VE HAD THEIR PLTS NOT UNDERSTANDING CLRLY WHAT WAS BEING SAID TO THEM IN A HURRY! THEY JUST DID WHATEVER THEY WANTED TO WITH NO REAL UNDERSTANDING OF HOW THEY ARE AFFECTING THE ACFT FLOW INTO THAT ARPT. THE CTLR SHOULD HAVE MAINTAINED BETTER SPACING AND EMPHASIZED THAT MORE CLRLY INSTEAD OF ALLOWING THE 757 TO PUT MY FLT IN A BIND.