Size of build directory difference between esp8266 and esp32

Development Platforms
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1

I noticed that the size of the Project/.pio/build directories can vary significantly between a esp8266 project and a esp32 based project.
esp8266 (modwifi): 7 Mbytes
esp32 (esp-wrover-kit): 97 Mbytes
How come this difference?
In the esp32 .pio/build directory two directories are dominant:
24M ./esp-wrover-kit/FrameworkArduino
17M ./esp-wrover-kit/libfb6 (Wifi)

Is there any way to avoid consuming this much disk space for every project, it seems not efficient?

2

Just leaned that the purpose of the “Clean” command in the Project Tasks is to remove that data.