Best IDE for AVR development in C?

Question

C++ / C#

I am developing for AVR ATmega in AVR C language. I used to use Atmel Studio, but it slows down a lot, which has recently become very annoying. Who can advise which medium to switch to?
Requirements:
1) AVR development in C
2) Lightweight and fast
3) (Optional, but highly desirable) a debugger
4) (Optional, but I would like) the presence of configuration assistants (for internal and external subsystems)
5) (Optional) UBasp support

Answer 1

vim + avr-gcc + make + gdb

Answer 2

microC AVR or Bascom will do well. they can connect libraries for screens and LEDs. there are templates and a lot of tutorials for the little ones.

Answer 3

I opted for sloeber (configured eclipse). True, if you use a T-shirt advertisement for free, it pops up in half an hour, but close it and work on, or donate. In general, I'm more comfortable than Atmel Studio.