[KL1SK]

There is such code:

local EM = CreateFrame('Frame')
 
testTable = {}
for i = 1, 100000 do
    testTable[i] = i
end
 
function DefPairs()
    local startTime = GetTime()
    for k, v in pairs(testTable) do
        print(k)
    end
    print("LeadTime: " .. GetTime() - startTime)
end
 
function SmoothPairs(table, mult, callback)
    EM:SetScript("OnUpdate", nil)
 
    local prevFrameTime     = 0
    local startTime         = GetTime()
    local index, var        = nil, nil
 
    EM:SetScript("OnUpdate", function(self, elapsed)
        if prevFrameTime == 0 then
            prevFrameTime = GetTime()
        else
            local startFrameTime    = GetTime()
            local frameDeltaTime    = startFrameTime - prevFrameTime
            prevFrameTime           = startFrameTime
 
            local timeForWork       = ( 0.0001 / frameDeltaTime ) * mult
            local stopTaskTime      = startFrameTime + timeForWork
 
            while GetTime() < stopTaskTime do
                index, var = next(table, index)
                if not index then
                    EM:SetScript("OnUpdate", nil)
                    print("LeadTime: " .. GetTime() - startTime)
                    return
                else
                    callback(index, var)
                end
            end
        end
    end)
end
 
function StopSmoothPairs()
    EM:SetScript("OnUpdate", nil)
end
 
-- /run SmoothPairs(testTable, 1, function(k, v) print(k) end)
-- /run StopSmoothPairs()
-- /run DefPairs()

But it does not work as expected. Assault GetTime() returns always the same value inside the frame.
Later try to check using "anim:SetScript("OnLoop", ...)", he seems to have no such restrictions.