Well, at least we can say we are agree on majority of the items, at least all that really matter:
1 - Is Rambooting from a LZ4 compressed fixed size VHD a real improvement compared with an expandable VHD or not?
Agree it is faster.
Your timing improvement (4 seconds) is better than mine since your VHD is on a SSd and mine on a HDD and also your Ram speed is faster than mine, this also probes I was right on my suspect: I reached the speed limits of reading the HDD and writing to Ram of my PC, reason why I only got about 1/3 of a second of improvement.
2 - Is the time consumed to build a LZ4 compressed VHD a valid investment or not?
Agree it is faster, also agree the smaller the faster.
Also you save valuable space if booting from a fast USB 3.0 stick or fast microSD (32 GB) connected to a USB 3.0 adapter (the last was also used on my own tests).
3 - From my tests I know 1.5 GB is good size for PCs with a minimum of 4 GB of Ram, but is there a way to find a size that fits better in accordance with the Ram available on each PC?
Agree the smaller the better.
My only comment here is we need to have enought free space on the VHD to let Windows and the programs we will run (as an example browsers) write to their profile an cache (both located on C:) as they do on any OS. So free space required on VHD seems to vary a lot according with user prefered programs (as an example Chrome require more free space on C: [the VHD loaded on Ram] than FireFox), also if you are planning to watch pictures (let's say using Netflix) we will need additional free space for this. So IMHO the total size of VHD should be determined for the user by means of his own test, I suggest start with a 1.5 GB size wich is close to max size (1.7 GB on my tests, but may vary) for PCs with 4 GB Ram and if required just make a new 1/2 GB bigger size Wimboot VHD in a few minutes, I don't think you will have to go bigger than 4 GB in any case.
JFYI I allways try to have about 1 GB free space, but once again each install and user preferences is different.
4 - Is Rambooting from a LZ4 compressed fixed size VHD better for?:
- Booting from HDD.
- Booting from SSD.
Agree. It is the best option on any case.
5 - Is Rambooting from an expandable VHD better for?:
- Booting from HDD.
- Booting from SSD.
Agree, Rambooting from a LZ4 compressed fixed size VHD is better.
And about the other things you also answered, they were not questions to try to optimice settings from comparing with other people system, those were only some additional comments I made about my own opinion of certain things. Of course everybody is free to have his own opinion and do things in a different way.
alacran