Open all files in directory in vim
Solution 1:
Default tabpagemax is 10 as being pointed out by muru.
you can increase it by setting, for example to 100, to open 100 files max by default
set tabpagemax=100
and then use vim -p *.c
Does it have visible performance impact, Need to check
Note: Adding as a answer here as I don't have enough repo to add comment