After changing the SD card, the mobile began to slow down?

Question

Android

Mobile LG Optimus One. I bought a 16 GB card, class 4 (Micro SDHC 16Gb Class 4 Kingston [SDC4/16GB-2ADP] Retail). Everything is fine, but a number of programs began to slow down. For example, in FBReader, pages freeze a little before scrolling. Why could this be?
I transferred the information from the old card to the new one completely (from the connected android in the drive mode to the card reader, after which I changed the card in the phone).

Answer 1

chinese mb card

Answer 2

Here is a program for checking cards. It checks card integrity and speed. I have a Chinese card on 16GB at home, only on it, in fact, 2 GB.

Answer 3

By the way, Chinese cards can be identified by their appearance. They are often smeared or unevenly printed characters.

Answer 4

Class 4 - sparse. 6-8 would be nice, ideally 10.