Best way to import data in google-colaboratory for fast computing and training?

I am running a simple deep learning model on google's colab what my problem is it's running slower than my MacBook air with no GPU.

I read this and found out it's problem because of dataset importing over internet. But unable to figure out proper step to fasten up the process.

Google Colab is very slow compared to my PC

My model is this -

https://colab.research.google.com/drive/1Q1Q9MEfIv_ldb5ffZfC1wxzjq1rd1hKd

Any idea how I can make the epoch faster ?

My local machine takes 0.5-0.6 seconds per epoch and google-colabs takes 3-4 seconds

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