Multilevel CTE Expression slows the execution (Reposted with changes) [duplicate] - sql

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Multilevel CTE Expression slows the execution [closed]
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In SQL Server, I have a table-valued function which contains a multi-level CTE as shown in the code here:
CREATE FUNCTION [dbo].[GetDataset_Test]
(#XMLBlock XML, #Id INT)
RETURNS
#tempTable TABLE
(
methodID INT,
[Id] INT,
SavingMessage varchar(50)
)
AS
BEGIN
DECLARE #ObjectID INT = 2;
DECLARE #ExchangeRate INT = 2;
DECLARE #Cond INT = 1;
DECLARE #Param1 varchar(50) = 'name1';
DECLARE #Param2 varchar(50) = 'name2';
WITH CTE AS
(
SELECT
Col1,
con,
DiscountLine,
tempNumber,
ItemCostExVAT,
Quantity,
SomeValue,
methodID,
VATAmount,
SubTypeID,
Line,
VATMultiplier,
ROUND(dbo.GetAmountCustomFunction(COALESCE(Id, AnotherId), COALESCE(Price, PriceValue)), 2) As [Amount]
FROM
dbo.GetObject(#Id, #ObjectID, #ParameterBlock) AS BC
INNER JOIN
dbo.fnPrices(#ID, #CurrencyID) BPD ON BPD.Id = BC.productid
),
CTE1 AS
(
SELECT
*,
CASE WHEN con = 0 THEN Quantity ELSE 1 END AS Quantity
FROM
CTE
WHERE
1 = SomeValue
),
CTE2 AS
(
Select *,
MIN(CASE WHEN DiscountLine=1 THEN 1 ELSE 20 END) over (PARTITION by tempNumber) As StockControlled,
SUM(ItemCostExVAT * Quantity) OVER ( PARTITION BY tempNumber ) AS tempCost ,
ROUND(CASE
WHEN methodID = 8 THEN DiscValue
WHEN methodID = 2 THEN END ,
DicsValue,VATAmount),2) AS AmountExVAT
From CTE1
),
CTE3
(
SELECT
*,
ROUND(CASE
WHEN SubTypeID = 1 AND Line = 1 THEN -1 * AmountExVAT
ELSE 20
END, 2) PriceExVAT
FROM
CTE2
),
CTE4
(
SELECT
*,
ROUND(#ExchangeRate * CASE WHEN #Cond = 1 THEN AmountExVAT * VATMultiplier ELSE 20 END, 2) CashBack
FROM
CTE3
),
CTE5
(
SELECT
*,
dbo.FormatMessage(#Param1, #Param2) AS SavingMessage
FROM
CTE4
)
INSERT INTO #tempTable
SELECT
methodID, [Id], SavingMessage
FROM
CTE5
RETURN
END
In above query because of multi-level CTE and table value parameter I can think that its trying to query recursively and taking more execution time.
I know that we cannot use temporary table as function parameter, is there any alternative of this or can I use temporary table by any way in function?
Or can I make some changes in CTE to improve my T-SQL function query execution time?