diff --git a/sky130/openlane/config.tcl b/sky130/openlane/config.tcl
index f870745..93c04e1 100755
--- a/sky130/openlane/config.tcl
+++ b/sky130/openlane/config.tcl
@@ -25,6 +25,13 @@
 	$::env(PDK_ROOT)/$::env(PDK)/libs.ref/verilog/sky130_fd_io/sky130_ef_io.v\
 	$::env(PDK_ROOT)/$::env(PDK)/libs.ref/verilog/sky130_fd_io/sky130_ef_io__gpiov2_pad_wrapped.v\
 	"
+
+# Optimization library 
+set ::env(TECH_LEF_OPT) "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/techLEF/$::env(STD_CELL_LIBRARY_OPT)/$::env(STD_CELL_LIBRARY_OPT).tlef"
+set ::env(CELLS_LEF_OPT) [glob "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/lef/$::env(STD_CELL_LIBRARY_OPT)/*.lef"]
+set ::env(GDS_FILES_OPT) [glob "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/gds/$::env(STD_CELL_LIBRARY_OPT)/*.gds"]
+set ::env(STD_CELL_LIBRARY_OPT_CDL)	"$::env(PDK_ROOT)/$::env(PDK)/libs.ref/cdl/$::env(STD_CELL_LIBRARY_OPT)/$::env(STD_CELL_LIBRARY_OPT).cdl"
+
 #else (!EF_FORMAT)
 set ::env(TECH_LEF) "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/$::env(STD_CELL_LIBRARY)/techlef/$::env(STD_CELL_LIBRARY).tlef"
 set ::env(CELLS_LEF) [glob "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/$::env(STD_CELL_LIBRARY)/lef/*.lef"]
@@ -40,8 +47,23 @@
 	$::env(PDK_ROOT)/$::env(PDK)/libs.ref/sky130_fd_io/verilog/sky130_ef_io.v\
 	$::env(PDK_ROOT)/$::env(PDK)/libs.ref/sky130_fd_io/verilog/sky130_ef_io__gpiov2_pad_wrapped.v\
 	"
+
+# Optimization library 
+set ::env(TECH_LEF_OPT) "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/$::env(STD_CELL_LIBRARY_OPT)/techlef/$::env(STD_CELL_LIBRARY_OPT).tlef"
+set ::env(CELLS_LEF_OPT) [glob "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/$::env(STD_CELL_LIBRARY_OPT)/lef/*.lef"]
+set ::env(GDS_FILES_OPT) [glob "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/$::env(STD_CELL_LIBRARY_OPT)/gds/*.gds"]
+set ::env(STD_CELL_LIBRARY_OPT_CDL)	"$::env(PDK_ROOT)/$::env(PDK)/libs.ref/$::env(STD_CELL_LIBRARY_OPT)/cdl/$::env(STD_CELL_LIBRARY_OPT).cdl"
+
 #endif (!EF_FORMAT)
 
+# Optimization library slowest corner 
+set tmp $::env(STD_CELL_LIBRARY)
+set ::env(STD_CELL_LIBRARY) $::env(STD_CELL_LIBRARY_OPT)
+source "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/$::env(STD_CELL_LIBRARY_OPT)/config.tcl"
+set ::env(LIB_SLOWEST_OPT) $::env(LIB_SLOWEST)
+set ::env(STD_CELL_LIBRARY) $tmp 
+source "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/$::env(STD_CELL_LIBRARY)/config.tcl"
+
 set ::env(GPIO_PADS_LEF_CORE_SIDE) "\
 	$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/custom_cells/lef/sky130_fd_io_core.lef\
 	$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/custom_cells/lef/sky130_ef_io_core.lef\
@@ -95,6 +117,9 @@
 # Default DRC Exclude List
 set ::env(DRC_EXCLUDE_CELL_LIST) "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/$::env(STD_CELL_LIBRARY)/drc_exclude.cells"
 
+# DRC Exclude List for Optimization library 
+set ::env(DRC_EXCLUDE_CELL_LIST_OPT) "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/$::env(STD_CELL_LIBRARY_OPT)/drc_exclude.cells"
+
 set ::env(GLB_RT_L1_ADJUSTMENT) 0.99
 
 # Extra PDN configs