Smaller pruned model yolov8s doesn't faster than original yolov8s on Tensor RT Jetson Nano

Description

I have 2 model yolov8s and pruned model yolov8s with smaller size. For the second model, I pruned its channel using structural pruning method of Torch pruning. After pruning with the pruning rate of 0.2, I converted both the original and pruned models to onnx and then converted these onnx models to FP16 engine model on Jetson Nano using python.
When I test the FPS, the pruned model is not faster than the original model (Both FPS is about 7.4). I also tried with a pruning rate of 0.4 the pruned model's FPS increased to 8.5, but the increased FPS is too low with such a pruning rate.
Here is my layer profile of 2 model:
yolov8s.txt
yolov8s_0,2_pruning.txt

Environment

TensorRT Version:
8.2.1.8
NVIDIA GPU:

NVIDIA Driver Version:

CUDA Version:
10.2
CUDNN Version:
8.2.1.32

Operating System:
Ubuntu 18.04
Python Version (if applicable):
3.6
Tensorflow Version (if applicable):

PyTorch Version (if applicable):

Baremetal or Container (if so, version):

Relevant Files

Model link:

Steps To Reproduce

Commands or scripts:

Have you tried the latest release?:

Can this model run on other frameworks? For example run ONNX model with ONNXRuntime (polygraphy run <model.onnx> --onnxrt):