D2k build and charge times and game speed

[penev92]

It has recently come up on Discord that our build- and charge-times may not be true to the original game's times.
After some testing with Dune 2000's in-game mission timer (details in that same discussion) we agreed to set a baseline for the game speeds where our Normal speed would match 2x the "normal" speed (as defined by the in-game clock) of the original game - link to Discord.
People who want to play on the original's Normal speed can play on our Slowest speed, which happens to be half the Normal speed, so should match the original perfectly.

With that relation set, we can now tweak our unit/building/upgrade build times, ability/cloak/support power charge times, weapon reload times, projectile and unit movement speeds to exactly match the original.

Important things to note:

• With some testing in TibEd it was established that the build time formula is
  900/x = build_time_in_seconds, where x can be directly taken from TibEd:
  
  (Explanation also here - WW games run at 15 ticks per second so that's 900 ticks in a minute).
  So in ORA the build times would be simply need to be transfered from TibEd using 25*900/x.
  Edit: Final formula used is (900*25)/(2*<actor_build_factor_in_TibEd>) = <openRA_ticks>, or 11250/<BuildSpeed> = <openRA_ticks>.
• All faction variants of all actors have the same build coefficient according to TibEd.
• The "build speed" for building upgrades is hidden behind the so called Unknown.Long48 property in TibEd. It uses the same formula as actor production.
• Build time increases x2 when the player is at Low power and x3 when on Critical. Low is 51%-100% and Critical is 0%-50%, as in OpenRA.
• Build time seems to drop to 2/3 on 2 production structures and 1/2 on 3 production structures. More than 3 production structures apparently don't give further bonuses. Units and buildings benefit from this; Upgrades don't.
• Support powers are based on actors that can be found in the Units list in TibEd and their charge times follow the same rules as unit production times.

Adding a tracking list of things that need to be fixed here:

• Adjust unit, building and upgrade build times to match the original. [Adjust D2k actor build times #18120]
• Adjust multiple production structures speedup coefficients. [Adjust D2k actor build times #18120]
• Adjust Low and Critical power production slowdown coefficient.
• Adjust Saboteur cloak charge time. [Added manual Saboteur cloaking #17823]
• Adjust Support power charge times.
• Adjust cloaked units' recloak delay.
• Adjust unit movement speed.
• Adjust unit rate of fire.
• Adjust projectile travel speed.
• Adjust mission timers and timed triggers (?)

[penev92]

When I started "fixing" the build speeds I found trace references in the rules and eventually tracked down the PRs responsible for the current values - #9453 and the related #9106.
Since those provided little-to-no explanation of how and why they did things (and people don't seem to remember), this made me hesitant to completely throw away the work that was done 5 years ago and redo it again, but I am fairly confident in the approach this time (as it has been discussed on Discord multiple times).
This is probably a good time to ping @reaperrr since I can't get in touch with him on neither Discord nor IRC.

With that in mind I am creating these "Documentation" issues to try and document as thoroughly as possible the decisions that are being made and how and why changes are happening to D2k, so if anyone needs to check in some years it's all here.

So remembering all the relevant information from the original post, here are the raw values from TibEd for future reference:

Buildings

Actor	Build coefficient	Build time	Ticks in OpenRA	Time in OpenRA*
Concrete	180	5s	62.5 (62)	3s
Big concrete	120	7.5s	93.75 (94)	4s
ConYard	0	-		48s
Wind Trap	54	16.67s	208.33 (208)	9s
Barracks	42	21.43s	267.86 (268)	11s
Refinery	18	50s	625	25s
Silo	72	12.5s	156.25 (156)	7s
Light Factory	35	25.7s	321.42 (321)	13s
Heavy Factory	15	60s	750	30s
Outpost	36	25s	312.5 (312)	13s
Star port	18	50s	625	25s
Wall	180	5s	62.5 (62)	3s
Gun Turret	42	21.43s	267.86 (268)	11s
Missile Turret	36	25s	312.5 (312)	13s
Repair pad	30	30s	375	15s
High-tech Factory	24	37.5s	468.75 (468)	19s
Research Center	36	25s	312.5 (312)	13s
Palace	12	75s	937.5 (937)	38s

Upgrades

Actor	Build coefficient	Build time	Ticks in OpenRA	Time in OpenRA*
ConYard	18	50s	625	25s
Barracks	54	16.67s	208.33 (208)	9s
Light Factory	42	21.43s	267.86 (268)	11s
Heavy Factory	24	37.5s	468.75 (468)	19s
High-tech Factory	12	75s	937.5 (937)	38s

Units

Actor	Build coefficient	Build time	Ticks in OpenRA	Time in OpenRA*
Carryall	15	60s	750	30s
Light infantry	180	5s	62.5 (62)	3s
Trooper	132	6.81s	85.2 (85)	4s
Engineer	90	10s	125	5s
Thumper	90	10s	125	5s
Grenadier	120	7.5s	93.75 (94)	4s
Sardaukar	120	7.5s	93.75 (94)	4s
Sardaukar (MP-only)	70	12.86s	160.71 (160)	7s
MCV	15	60s	750	30s
Harvester	18	50s	625	25s
Trike	50	18s	225	9s
Raider	50	18s	225	9s
Raider (stealth)	50	18s	225	9s
Quad	35	25.7s	321.42 (321)	13s
Combat tank	26	34.6s	432.69 (432)	18s
Siege tank	30	30s	375	15s
Missile tank	22	40.9s	511.36 (512)	21s
Sonic tank	20	45s	562.5 (562)	23s
Deviator	20	45s	562.5 (562)	23s
Devastator	18	50s	625	25s

*On Normal speed.

[penev92]

Keeping with the double speed idea and the knowledge from the original post that support powers share the timing pipeline with producible actors and using the Dune 2000 in-game clock for timing, we also get:

Support power	"Build" coefficient	Charge time	Ticks in OpenRA	Time in OpenRA*
Ornithopter strike	2	7:30	5625	3:45
Death Hand Missile	2	7:30	5625	3:45
Fremen	5	3:00	2250	1:30
Saboteur	5	3:00	2250	1:30

Misc	Charge time	Ticks in OpenRA	Time in OpenRA*
Saboteur cloak charge	1:40	1250	0:50
Saboteur cloak discharge	0:30	375	0:15
Stealth actor recloak	2s	25	1s

*On Normal speed.