start jagged alliance 3 together with cheat engine and set speedhack to 2x. don't forget to set keyboard shortcuts to enable disable speedhack

ja3.bat

@echo off
start "" "steam://run/1084160"
timeout /t 5 /nobreak > nul
start "" "C:\Program Files\Cheat Engine\Cheat Engine.exe" "D:\Games\ja3.ct"

ja3.ct

local processName = "ja3.exe"
local speeds = {1.0, 2.0, 3.0}
local currentIndex = 2  -- Start at 2x speed

-- Attach to game
if getProcessIDFromProcessName(processName) ~= nil then
    openProcess(processName)

    -- -- Set initial speed
    -- if speedhack_setSpeed then
    --     speedhack_setSpeed(speeds[currentIndex])
    --     print("Speedhack set to " .. speeds[currentIndex] .. "x")
    -- else
    --     print("Speedhack not available.")
    -- end
else
    print("Process not found: " .. processName)
end

-- Backspace key code
local VK_BACK = 0x08

-- Toggle speed function
function toggleSpeed()
    currentIndex = currentIndex + 1
    if currentIndex > #speeds then
        currentIndex = 1
    end
    speedhack_setSpeed(speeds[currentIndex])
    -- print("Speed toggled to " .. speeds[currentIndex] .. "x")
end

-- Register Backspace hotkey
createHotkey(toggleSpeed, VK_BACK)

-- Hide Cheat Engine window
getMainForm().Visible = false