I came across recently, as you do, an option to maximise the performance of my lowly OCZ Core V2 SSD in Ubuntu. Apparently the kernel goes to quite extreme lengths (in terms of using CPU cycles) to avoid doing seeks. With a “standard” hard drive this is desirable because the time it takes the head to move to the correct location is more costly. Seeking is irrelevant as far as an SSD is concerned and using extra CPU time only serves to reduce I/O performance. Happily there is an option to tell the kernel that you are using a non-rotational media for a specific drive designation i.e. sda, sdb, etc. and therefore maximise SSD performance.
GPT stands for “GUID Partition Table” and it refers to a relatively new format for disk partition tables. It was designed to get around the limitations of the MBR format, namely that you can have more than 4 primary partitions and partitions can be more than 2.2 terabytes in size. GPT is part of the EFI standard but it can also be used on standard BIOS only machines i.e. most non-MAC PCs. Converting to GPT will allow you to future proof your partitions. 2 TB disks are becoming common and it won’t be long before the 2.2TB limit of MBR will stop people using all their disk space in one partition, so in the name of usability and flexibility GPT is the way forward.