Just my feedback about your original Roland question and latency:
I’ve a Roland TD12 as well with RME Fireface 802 audio interface (Firewire). I use Windows with Reaper and SD3 samples located on a normal 7200rpm harddisk, Intel Core I7.
My smallest possible buffer size is 64 Samples on 48kHz sample rate and no clicks and pops with SD3, but never tried this with SD2. This is similar to:
Output latency: 2.8ms
Buffer latency: 1.0ms
This is extremely good compared with other audio software which requires most of the times larger buffer sizes.
In a normal recording setup I always use 128 samples, 48kHz in Reaper with SD2 or SD3. Then it is also possible to add additional effects outside SD. This is similar to:
Output latency: 4.8ms
Buffer latency: 2.7ms
To be honest, I don’t hear/feel the difference between 64 or 128 samples.
For mastering I always use high buffer sizes such as 1024 samples where latency does not make sense.
My conclusion:
– SD3 has a very good performance and impossible to hear latency which makes it ideal for E-Drum recordings and playing live.
– An SSD decreases loading time at startup compared with a HD, but has no effect on playing when it’s loaded in RAM.
– Additionally, the whole repsonse of the kits in SD3 is much better, including the HH control. The dynamic range of the new kits is much better, even with a clean kit without any effects. I wish SD3 was 10 years earlier available.
I can’t say anything about MAC. Maybe this is helpful for others… 
@Henrik said:
Can you describe the problem a bit more, e.g. what is it you want to be fixed?
Hi Henrik,
The original text is located on this page (scroll a little bit down):
https://www.toontrack.com/manual/superior-drummer-3/7/7-3-edit-midi-edit-play-style-and-the-grid-editor/#7-3-2-the-grid-editor
Original text:
—
Grid editor header bar:
Cursor tools
The Arrow tool allows you to select a note or group of notes by lassoing them.
The Pencil tool allows you to add notes to the Song block.
To avoid the need to constantly switch between tools The arrow tool can be instantly changed to the add note tool by pressing Command + Option (Mac) on your keyboard (Alt+Control PC).
—
When you hover over the “mouse pointer” icon in the Grid editor (upper left corner), it displays the tooltip:
“Pointer tool; use to select or move notes”, but the user guide mentions “Arrow tool” which is confusing.
Note: The tooltip on the “mouse pointer” in the MIDI track (lower left corner) also mentions “Pointer Tool (1)” which is correct.
I suggest the following improvements:
1. Change the user manual to: “The Pointer tool allows you to select a note or group of notes by lassoing them. This can be activated with the number 1 key on your keyboard.”
2. Change the user manual to: “The Pencil tool allows you to add notes to the Song block. This can be activated with the number 2 key on your keyboard. “
3. Remove incorrect scentence “To avoid the need to constantly switch between tools The arrow tool can be instantly changed to the add note tool by pressing Command + Option (Mac) on your keyboard (Alt+Control PC).” because this opens the preview window on PC and does not switch between the two tools.
Same for 7.4 Editing Song Blocks on the Timeline:
4. “The Arrow tool will be the most commonly used” -> Change to: “The Pointer tool will be…” “This can be activate with the number 1 on your keyboard.”
5. “The Scissor tool allows you to cut/segment Song Blocks on the Song Track. This can be activated with the number 2 on your keyboard.”
6. Add keyboard shortcut 1 to the Pointer tooltip: “Pointer tool (1); use to select or move notes”.
7. Add keyboard shortcut 2 to the Pencil tooltip: “Pencil tool (2); use to insert new notes”.
Now all text and tooltips are consistent. I know how it works, someone decided to rename Arrow to Pointer as a last minute action. 
I hope this helps.
Thanks,
Erwin