I don't know if you already know this, but speed of SSD is dependent on size of SSD and also by how much of the drive is empty. Once it's more than 50% full it

I don't know if you already know this, but speed of SSD is dependent on size of SSD and also by how much of the drive is empty. Once it's more than 50% full it starts slowing down. I created a separate partition to deliberately leave 30% of the drive unallocated.