The share of the heap budget its expanded design may take before a simulation is started at shortStartClock rather than at what it was configured for.

How long after an edit the Simulation tab works out whether the design still builds. The check flattens the whole hierarchy, so this is what stops a burst of edits - drawing a run of wires, dragging out a selection - costing one flatten each. Long enough to cover the gap between two deliberate edits, short enough that the button follows the design rather than lagging behind it.

Needed to prevent possible overrun of simulation arrays

How tall the project browser's list of folders is. Fixed, and scrolling inside itself, so that a folder of 200 subfolders does not push the path bar off the top of the dialog.

How often the project browser re-reads the folder it is showing, so that a folder made or renamed outside Issie appears without being asked for. Listing a folder is one directory read plus one per subfolder in it - a millisecond or so for an ordinary folder, and 14ms for the worst one on a typical Windows machine - so this costs nothing worth measuring.

initial number of clock cycles navigated by the scrollbar.

Where a waveform simulation of a big design starts, in clock cycles. Enough to watch a design work; short enough that starting one is seconds rather than minutes.

Clock cycles allowed per unit of that share, below the threshold. 40 / share, which is exactly shortStartClock at the threshold and grows past any configured number as the design gets small - so an ordinary design starts at what it asked for and nothing else changes.

How many cycles a waveform simulation must hold beyond its last clock. Zooming out samples every Nth cycle, and reading the last sample can run a multiplier past LastClock - so the arrays carry a margin of one. It used to be the largest multiplier there is, whatever the simulation was: a 200-cycle simulation allocated 1203 cycles of arrays, six times what it could use. A multiplier bigger than LastClock samples nothing, so the margin is the largest that is not, and the one in use whatever that is - the zoom menu offers the current multiplier back even when the configuration has since shrunk under it.