eventually rebuild your kernel, reduce boot-loader timeout to 3 seconds and eventually make linux fast again by disabling mitigations.
cat /etc/fstab
vi /etc/lilo.conf
lba32
timeout = 100
boot = /dev/vda
root = /dev/vda1
image = /boot/vmlinuz
label = Linux
read-only
append = "ro mitigations=off"
re-write the boot-code
lilo shutdown -r now
and check after reboot
uname -r cat /proc/cmdline
see mbootpack