diff --git a/src/gpu.cpp b/src/gpu.cpp
index 65f7f4d..1c2443d 100644
--- a/src/gpu.cpp
+++ b/src/gpu.cpp
@@ -23,22 +23,24 @@ void detectHwmon(gpuSensors* target, std::string pci) {
 
 /* some metrics are missing in gpu_metrics, we always fill them from fs, unused metrics are commented out */
 void fillMissingMetrics(gpuSensors* g) {
-    g->vcore = std::stol(readFile(g->hwmon + "/in0_input", 4)) / 1000.0f;
+    static char buf[32];
+    fastReadNum(g->hwmon + "/in0_input", g->vcore) / 1000.0;
     // g->fan_pwm = std::stoi(readFile(g->hwmon + "/pwm1", 4)) * 100 / 256;
-    g->fan_speed = std::stol(readFile(g->hwmon + "/fan1_input", 4));
-    g->power_cap = std::stol(readFile(g->hwmon + "/power1_cap", 16)) / 1000000;
-    // g->power_cap_max = std::stol(readFile(g->hwmon + "/power1_cap_max", 16)) / 1000000;
-    g->vram_used = std::stoul(readFile(g->hwmon + "/../../mem_info_vram_used", 16));
-    // g->vram_total = std::stoul(readFile(g->hwmon + "/../../mem_info_vram_total", 16));
+    fastReadNum(g->hwmon + "/fan1_input", g->fan_speed);
+    fastReadNum(g->hwmon + "/power1_cap", g->power_cap) / 1000000;
+    // fastReadNum(g->hwmon + "/power1_cap_max", g->power_cap_max) / 1000000;
+    fastReadNum(g->hwmon + "/../../mem_info_vram_used", g->vram_used);
+    // fastReadNum(g->hwmon + "/../../mem_info_vram_total", g->vram_total);
 }
 
 /* get sensors for pre-vega cards (rx480/580) */
 void updateFromFs(gpuSensors* g) {
-    g->clock_core = std::stoll(readFile(g->hwmon + "/freq1_input", 16)) / 1000000;
-    g->clock_mem = std::stoll(readFile(g->hwmon + "/freq2_input", 16)) / 1000000;
-    g->power_avg = std::stol(readFile(g->hwmon + "/power1_input", 16)) / 1000000;
-    g->temp_edge = std::stol(readFile(g->hwmon + "/temp1_input", 2));
-    g->usage_core = std::stoi(readFile(g->hwmon + "/../../gpu_busy_percent"));
+    static char buf[32];
+    fastReadNum(g->hwmon + "/freq1_input", g->clock_core) / 1000000;
+    fastReadNum(g->hwmon + "/freq2_input", g->clock_mem) / 1000000;
+    fastReadNum(g->hwmon + "/power1_input", g->power_avg) / 1000000;
+    fastReadNum(g->hwmon + "/temp1_input", g->temp_edge) / 1000;
+    fastReadNum(g->hwmon + "/../../gpu_busy_percent", g->usage_core);
 }
 
 /* get sensors for vega and newer (rx5700xt, rx7800xt [*]) */