Make Ubuntu app opening faster in low-end hardware

If I want to open an app on my desktop it takes usually (4-10)s. I have a 4GB RAM and Intel Pentium® Dual Core @2.80 GHz and Intel® 945G Graphics card. This PC was purchased in 2010. It runs Ubuntu 20.10. I want a faster app opening experience in my PC and others having somewhat low-end hardware.

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