Your new camera has 3 times the resolution of the old, which would explain the lower framerate.
You could create a RAM drive and save the video to there, before copying to the SD card. Either that or try getting a high speed USB3 memory stick such as the SanDisk Extreme models and save to that.
www.domoticz.com/wiki/Setting_up_a_RAM_drive_on_Raspberry_Pi
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