How to achieve 120 fps on arducam B0348 camera

Hi arducam support team,
I have B0348 camera which supports 120 fps, but in my case I am not getting more than 40 fps.
I am using with raspberry pi 3b+ @ 1 gb ram.
My system detail information

[email protected]:~ $ uname -a
Linux raspberrypi 5.15.76-v7+ #1597 SMP Fri Nov 4 12:13:17 GMT 2022 armv7l GNU/Linux
[email protected]:~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 11 (bullseye)"
NAME="Raspbian GNU/Linux"
VERSION="11 (bullseye)"
[email protected]:~ $ cat /boot/config.txt
# For more options and information see
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border

# uncomment to force a console size. By default it will be display's size minus
# overscan.

# uncomment if hdmi display is not detected and composite is being output

# uncomment to force a specific HDMI mode (this will force VGA)

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display

# uncomment for composite PAL

#uncomment to overclock the arm. 700 MHz is the default.

# Uncomment some or all of these to enable the optional hardware interfaces

# Uncomment this to enable infrared communication.

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)

# Automatically load overlays for detected cameras

# Automatically load overlays for detected DSI displays

# Enable DRM VC4 V3D driver

# Disable compensation for displays with overscan

# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.


# Run as fast as firmware / board allows

[email protected]:~ $
[email protected]:~ $ dmesg | grep "arducam"
[   13.139563] arducam-pivariety 10-000c: firmware version: 0x10002
[   13.481058] arducam-pivariety 10-000c: Consider updating driver arducam-pivariety to match on endpoints
[email protected]:~ $

[email protected]:~ $ libcamera-vid --list-cameras
Available cameras
0 : arducam-pivariety [1600x1300] (/base/soc/i2c0mux/[email protected]/[email protected])
    Modes: 'SBGGR10_CSI2P' : 1280x720 [120.11 fps - (0, 0)/1280x720 crop]
                             1600x1080 [80.02 fps - (0, 0)/1600x1080 crop]
                             1600x1300 [60.04 fps - (0, 0)/1600x1300 crop]
           'SBGGR8' : 1280x720 [120.11 fps - (0, 0)/1280x720 crop]
                      1600x1080 [80.02 fps - (0, 0)/1600x1080 crop]
                      1600x1300 [60.04 fps - (0, 0)/1600x1300 crop]

Please guide me.

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