diff --git a/freqtrade/optimize/space/decimalspace.py b/freqtrade/optimize/space/decimalspace.py
index 643999cc1..220502e69 100644
--- a/freqtrade/optimize/space/decimalspace.py
+++ b/freqtrade/optimize/space/decimalspace.py
@@ -7,11 +7,15 @@ class SKDecimal(Integer):
     def __init__(self, low, high, decimals=3, prior="uniform", base=10, transform=None,
                  name=None, dtype=np.int64):
         self.decimals = decimals
-        _low = int(low * pow(10, self.decimals))
-        _high = int(high * pow(10, self.decimals))
+
+        self.pow_dot_one = pow(0.1, self.decimals)
+        self.pow_ten = pow(10, self.decimals)
+
+        _low = int(low * self.pow_ten)
+        _high = int(high * self.pow_ten)
         # trunc to precision to avoid points out of space
-        self.low_orig = round(_low * pow(0.1, self.decimals), self.decimals)
-        self.high_orig = round(_high * pow(0.1, self.decimals), self.decimals)
+        self.low_orig = round(_low * self.pow_dot_one, self.decimals)
+        self.high_orig = round(_high * self.pow_dot_one, self.decimals)
 
         super().__init__(_low, _high, prior, base, transform, name, dtype)
 
@@ -25,9 +29,9 @@ class SKDecimal(Integer):
         return self.low_orig <= point <= self.high_orig
 
     def transform(self, Xt):
-        aa = [int(x * pow(10, self.decimals)) for x in Xt]
-        return super().transform(aa)
+        return super().transform([int(v * self.pow_ten) for v in Xt])
 
     def inverse_transform(self, Xt):
         res = super().inverse_transform(Xt)
-        return [round(x * pow(0.1, self.decimals), self.decimals) for x in res]
+        # equivalent to [round(x * pow(0.1, self.decimals), self.decimals) for x in res]
+        return [int(v) / self.pow_ten for v in res]