Your ST-Ram access figures are better than PAK 68/3 (68030 32Mhz) (below), but still lower than reached by the BLiTTER - 4Mb/s for both operations - write and read, and 2MB/s for copy.
Ideally, you want as little as possible to live in ST-Ram as it will be restricted by the 8Mhz system bus.
And speaking of which.. here is EmuTOS running in FastRAM:
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I imagine also loading up NVDI (in FastRAM) would make for some pretty crazy numbers..
At the moment I am mainly using EmuTOS, but I believe it will be possible to get TOS2.06 running from FastRAM as well by using SELTOS.PRG (source is available in case we need to modify the relocation destination)
Unfortunately everything is a little cumbersome and limiting at the moment until I can get the IDE stuff working.. I am limited to using 360Kb floppies on a dying single-sided drive..
Planning on at least ordering a Gotek drive. And I am contemplating buying an Ultrasatan if that could give me working HDD until I can get the IDE stuff sorted out - I really don't want to spend money on a device I'm not going to use in the long run though, also I don't know if it even works together with the TF534.
And yes, the TF534 fits beautifully inside the original ST model
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It's dirty and crusty, but hey, it's been in the attic for ~25 years...