One of the irritating things is that the percentage stops at 99% when I download or upload something. One irritating thing is that the percentage stops at 99% when I download or upload something.

'One of the ...' implies that you will talk about other irritating things as well.

For example, when I triedy to transfer data from the/my USB to my laptop, it's goinges well until 90%. For example, when I try to transfer data from the/my USB to my laptop, it goes well until 90%.

You’re mixing up tenses a bit

However, the last 10% was longer than the first 90%. However, the last 10% was longer than the first 90%.

However, the last 10% wastook longer than the 90%. However, the last 10% took longer than the 90%.

The rise speed of the number going up was slower, and it stopped at 99% for a certain time. The speed of the number going up was slower, and it stopped at 99% for a certain time.

I wonder why this phenomenon often happens so often. I wonder why this phenomenon happens so often.

I guess it's like I lied I didabout doing my homework when asked, and had to do it desperately later. I guess it's like I lied about doing my homework when asked, and had to do it desperately later.

I guess it's like I lied I didabout doing my homework when asked, and had to do it desperately later. I guess it's like I lied about doing my homework when asked, and had to do it desperately later.

I’m unsure of your meaning of ‘desperately’ here.