While playing some Demos of games, 1 megabyte of log is written every 2 seconds. After playing for a while, the log is 700 megabytes large. When the game crashes, it feels inconvenient to upload it, because it is so large. Is there any way to narrow down the log to only the most relevant information? For example, if a game crashes after playing for an hour, is there any way to determine the last few minutes of gameplay? Does this happen in all games?

It happened for me while using the Dec 4 release of Xenia (latest) while playing Diablo 3, Pixar Up, and Sonic Unleashed. I can test more games if you'd like me to

The rapid speed of writing to log was happening during 3D scenes.
During 2D intro cutscenes, the logs were increasing at a slower rate