MKR1000 and MPU6050

Hi every one !
I bought an mkr1000 to replace my UNO, who was too slow and who doesn't have wifi. I use the mpu6050 library, but there is the FIFO overflow error which is displaying all the time (like every 20 line). I see here that I need to change the wire clock rate (400kHz for 16MHz CPU) ... Well, the mkr1000 have a 48Mhz CPU, so I change the rate from 400kHz to 1200kHz, but the error still here ... What do I need to do ?