diff --git a/hw/rtl/core/VX_core.sv b/hw/rtl/core/VX_core.sv
index 37db6123..45426053 100644
--- a/hw/rtl/core/VX_core.sv
+++ b/hw/rtl/core/VX_core.sv
@@ -429,6 +429,9 @@ module VX_core import VX_gpu_pkg::*; #(
             //             this will be a subset of scb_stalls
             $display("issue scoreboard: fires total:\t%d across ISSUE_WIDTH=%d",
                      pipeline_perf_if.scb_fires, `ISSUE_WIDTH);
+            $display("issue scoreboard: cycles fired:\t%d (%.2f%%)",
+                     pipeline_perf_if.scb_any_fire_cycles,
+                     $itor(pipeline_perf_if.scb_any_fire_cycles) / $itor(cycles) * 100.0);
             $display("issue scoreboard: stalls total:\t%d across ISSUE_WIDTH=%d",
                      pipeline_perf_if.scb_stalls, `ISSUE_WIDTH);
             $display("issue scoreboard: stalls by operand hazard: alu %d (%2.2f cycles per issue)",
@@ -468,7 +471,7 @@ module VX_core import VX_gpu_pkg::*; #(
                      pipeline_perf_if.dispatch_fires[`EX_LSU]);
             $display("issue dispatch: fires: sfu %d",
                      pipeline_perf_if.dispatch_fires[`EX_SFU]);
-            $display("issue dispatch: cycles issued: %d (%.2f%%)",
+            $display("issue dispatch: cycles fired: %d (%.2f%%)",
                      pipeline_perf_if.dispatch_any_fire_cycles,
                      $itor(pipeline_perf_if.dispatch_any_fire_cycles) / $itor(cycles) * 100.0);
             $display("ifetches: %d", perf_ifetches);
diff --git a/hw/rtl/core/VX_dispatch.sv b/hw/rtl/core/VX_dispatch.sv
index fa7c99de..0700d077 100644
--- a/hw/rtl/core/VX_dispatch.sv
+++ b/hw/rtl/core/VX_dispatch.sv
@@ -236,12 +236,12 @@ module VX_dispatch import VX_gpu_pkg::*; #(
     `BUFFER(perf_unit_valids_per_cycle_r, perf_unit_valids_per_cycle);
     `BUFFER(perf_unit_fires_per_cycle_r, perf_unit_fires_per_cycle);
 
-    reg perf_any_fire;
+    reg perf_any_fire_per_cycle;
     always @(*) begin
-        perf_any_fire = 1'b0;
+        perf_any_fire_per_cycle = 1'b0;
         for (integer i = 0; i < `NUM_EX_UNITS; ++i) begin
             if (perf_unit_fires_per_cycle_r[i] != '0) begin
-                perf_any_fire = 1'b1;
+                perf_any_fire_per_cycle = 1'b1;
             end
         end
     end
@@ -257,7 +257,7 @@ module VX_dispatch import VX_gpu_pkg::*; #(
                 perf_stalls_r[i] <= perf_stalls_r[i] + `PERF_CTR_BITS'(perf_unit_stalls_per_cycle_r[i]);
                 perf_valids_r[i] <= perf_valids_r[i] + `PERF_CTR_BITS'(perf_unit_valids_per_cycle_r[i]);
                 perf_fires_r[i] <= perf_fires_r[i] + `PERF_CTR_BITS'(perf_unit_fires_per_cycle_r[i]);
-                perf_any_fire_cycles_r <= perf_any_fire_cycles_r + `PERF_CTR_BITS'(perf_any_fire);
+                perf_any_fire_cycles_r <= perf_any_fire_cycles_r + `PERF_CTR_BITS'(perf_any_fire_per_cycle);
             end
         end
     end
diff --git a/hw/rtl/core/VX_issue.sv b/hw/rtl/core/VX_issue.sv
index ef7cf31b..4e79ce70 100644
--- a/hw/rtl/core/VX_issue.sv
+++ b/hw/rtl/core/VX_issue.sv
@@ -62,6 +62,7 @@ module VX_issue #(
     `ifdef PERF_ENABLE
         .perf_scb_stalls(perf_issue_if.scb_stalls),
         .perf_scb_fires (perf_issue_if.scb_fires),
+        .perf_scb_any_fire_cycles (perf_issue_if.scb_any_fire_cycles),
         .perf_units_uses(perf_issue_if.units_uses),
         .perf_sfu_uses  (perf_issue_if.sfu_uses),
     `endif
diff --git a/hw/rtl/core/VX_scoreboard.sv b/hw/rtl/core/VX_scoreboard.sv
index 9d66d200..fe038fb5 100644
--- a/hw/rtl/core/VX_scoreboard.sv
+++ b/hw/rtl/core/VX_scoreboard.sv
@@ -22,6 +22,7 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
 `ifdef PERF_ENABLE
     output reg [`PERF_CTR_BITS-1:0] perf_scb_stalls,
     output reg [`PERF_CTR_BITS-1:0] perf_scb_fires,
+    output reg [`PERF_CTR_BITS-1:0] perf_scb_any_fire_cycles,
     output reg [`PERF_CTR_BITS-1:0] perf_units_uses [`NUM_EX_UNITS],
     output reg [`PERF_CTR_BITS-1:0] perf_sfu_uses [`NUM_SFU_UNITS],
 `endif
@@ -47,9 +48,13 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
 
     wire [`ISSUE_WIDTH-1:0] perf_issue_fires_per_cycle;
     wire [`CLOG2(`ISSUE_WIDTH+1)-1:0] perf_fires_per_cycle, perf_fires_per_cycle_r;    
+    wire perf_any_fire_per_cycle, perf_any_fire_per_cycle_r;
+
+    reg [`PERF_CTR_BITS-1:0] perf_scb_empty;
 
     `POP_COUNT(perf_stalls_per_cycle, perf_issue_stalls_per_cycle);    
-    `POP_COUNT(perf_fires_per_cycle, perf_issue_fires_per_cycle);    
+    `POP_COUNT(perf_fires_per_cycle, perf_issue_fires_per_cycle);
+    assign perf_any_fire_per_cycle = |perf_issue_fires_per_cycle;
 
     for (genvar i=0; i < `NUM_EX_UNITS; ++i) begin
         always @(*) begin
@@ -91,16 +96,19 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
 
     `BUFFER(perf_stalls_per_cycle_r, perf_stalls_per_cycle);
     `BUFFER(perf_fires_per_cycle_r, perf_fires_per_cycle);
+    `BUFFER(perf_any_fire_per_cycle_r, perf_any_fire_per_cycle);
     `BUFFER(perf_units_per_cycle_r, perf_units_per_cycle);
     `BUFFER(perf_sfu_per_cycle_r, perf_sfu_per_cycle);
 
     always @(posedge clk) begin
         if (reset) begin
             perf_scb_stalls <= '0;            
-            perf_scb_fires <= '0;            
+            perf_scb_fires <= '0;
+            perf_scb_any_fire_cycles <= '0;
         end else begin
             perf_scb_stalls <= perf_scb_stalls + `PERF_CTR_BITS'(perf_stalls_per_cycle_r);
             perf_scb_fires <= perf_scb_fires + `PERF_CTR_BITS'(perf_fires_per_cycle_r);
+            perf_scb_any_fire_cycles <= perf_scb_any_fire_cycles + `PERF_CTR_BITS'(perf_any_fire_per_cycle_r);
         end
     end
 
@@ -257,4 +265,19 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
     
     end
 
+`ifdef PERF_ENABLE
+    wire [`ISSUE_WIDTH-1:0] ibuffer_valids;
+    for (genvar i = 0; i < `ISSUE_WIDTH; ++i) begin
+        assign ibuffer_valids[i] = ibuffer_if[i].valid;
+    end
+
+    always @(posedge clk) begin
+        if (reset) begin
+            perf_scb_empty <= '0;
+        end else begin
+            perf_scb_empty <= perf_scb_empty + `PERF_CTR_BITS'(~|ibuffer_valids);
+        end
+    end
+`endif
+
 endmodule
diff --git a/hw/rtl/interfaces/VX_pipeline_perf_if.sv b/hw/rtl/interfaces/VX_pipeline_perf_if.sv
index afdca4fa..874778b8 100644
--- a/hw/rtl/interfaces/VX_pipeline_perf_if.sv
+++ b/hw/rtl/interfaces/VX_pipeline_perf_if.sv
@@ -20,6 +20,7 @@ interface VX_pipeline_perf_if ();
     wire [`PERF_CTR_BITS-1:0] ibf_stalls;
     wire [`PERF_CTR_BITS-1:0] scb_stalls;
     wire [`PERF_CTR_BITS-1:0] scb_fires;
+    wire [`PERF_CTR_BITS-1:0] scb_any_fire_cycles;
     wire [`PERF_CTR_BITS-1:0] units_uses [`NUM_EX_UNITS];
     wire [`PERF_CTR_BITS-1:0] sfu_uses [`NUM_SFU_UNITS];
     wire [`PERF_CTR_BITS-1:0] dispatch_stalls [`NUM_EX_UNITS];
@@ -43,6 +44,7 @@ interface VX_pipeline_perf_if ();
         output ibf_stalls,
         output scb_stalls,
         output scb_fires,
+        output scb_any_fire_cycles,
         output units_uses,
         output sfu_uses,
         output dispatch_stalls,
@@ -58,6 +60,7 @@ interface VX_pipeline_perf_if ();
         input ibf_stalls,
         input scb_stalls,
         input scb_fires,
+        input scb_any_fire_cycles,
         input units_uses,
         input sfu_uses,
         input dispatch_stalls,