Translation of Optik

For example, if I am working very early in the morning, let's say 06.00 (that would be 09.00 your time), I don't notice it much. But 9 hours later, the system slows down, because people in Europe get online.
In the attachment you will find the reviewed documents. Your Portuguese is quite good. I understood everything. If you write the same text in German, I can know what you wanted to say.
I have problems with adjectives, endings and articles. The grammar is so difficult. I am very happy to learn Spanish with you. What went wrong with the lessons? Thanks and best regards.