diff --git a/src/Solver/Mage.py b/src/Solver/Mage.py
index 74f897da..a876f4a7 100644
--- a/src/Solver/Mage.py
+++ b/src/Solver/Mage.py
@@ -1083,7 +1083,7 @@ class Mage8(Mage):
             newline()
 
             reachs = []
-            iprofiles = {}
+            iprofiles = []
             profile_len = []
             reach_offset = {}
 
@@ -1099,14 +1099,14 @@ class Mage8(Mage):
                 i2 = data[2*i+1] - 1
 
                 # Add profile id correspondance to reach
-                key = (i1, i2)
-                iprofiles[key] = r
+                for key in range(i1, i2 + 1):
+                    iprofiles.append(i)
 
                 # Profile ID offset
                 reach_offset[r] = i1
                 profile_len.append(i2-i1+1)
 
-            logger.debug(f"read_bin: iprofiles = {iprofiles}")
+            logger.debug(f"read_bin: iprofiles = {len(iprofiles)}")
 
             endline()
 
@@ -1124,18 +1124,6 @@ class Mage8(Mage):
             # Data
             newline()
 
-            @timer
-            def ip_to_r(i): return iprofiles[
-                next(
-                    filter(
-                        lambda k: k[0] <= i <= k[1],
-                        iprofiles
-                    )
-                )
-            ]
-            @timer
-            def ip_to_ri(r, i): return i - reach_offset[r]
-
             # check results and geometry consistency
             for i, r in enumerate(reachs):
                 lp = len(r.profiles)
@@ -1165,9 +1153,9 @@ class Mage8(Mage):
                 if key in ["Z", "Q"]:
                     for i, d in enumerate(data):
                         # Get reach corresponding to profile ID
-                        reach = ip_to_r(i)
+                        reach = reachs[iprofiles[i]]
                         # Get profile id in reach
-                        ri = ip_to_ri(reach, i)
+                        ri = i - reach_offset[reach]
 
                         # Set data for profile RI
                         reach.set(ri, timestamp, key, d)