For the default setting, CDT is indeed very slow for large projects like Chromium. However, make change to eclipse.ini (providing large heap, the larger the better) and some preferences (mainly for how the code indexer works), CDT works smoothly for very large project. Just check the following link:

https://chromium.googlesource.com/chromium/src/+/refs/heads/... https://developer.mozilla.org.cach3.com/en-US/docs/Mozilla/D...

Please note that 16G RAM is assumed, I use 32G on my own laptop. I use Eclipse CDT for more than ten years successfully on all kinds of embedded projects.