diff --git a/case-lib/lib.sh b/case-lib/lib.sh
index 79c811ff..2f1a6f2e 100644
--- a/case-lib/lib.sh
+++ b/case-lib/lib.sh
@@ -966,9 +966,9 @@ perf_analyze()
     dlogi "Checking SOF component performance"
     if [ -e "$LOG_ROOT/mtrace.txt" ]; then
         if [ -e "$LOG_ROOT/dmesg.txt" ]; then
-            perf_cmd="sof_perf_analyzer.py --skip-to-first-trace --kmsg=$LOG_ROOT/dmesg.txt --out2html $LOG_ROOT/sof_perf.html $LOG_ROOT/mtrace.txt"
+            perf_cmd="sof_perf_analyzer.py --kmsg=$LOG_ROOT/dmesg.txt --out2html $LOG_ROOT/sof_perf.html $LOG_ROOT/mtrace.txt"
         else
-            perf_cmd="sof_perf_analyzer.py --skip-to-first-trace --out2html $LOG_ROOT/sof_perf.html $LOG_ROOT/mtrace.txt"
+            perf_cmd="sof_perf_analyzer.py --out2html $LOG_ROOT/sof_perf.html $LOG_ROOT/mtrace.txt"
         fi
         dlogc "$perf_cmd"
         eval "$perf_cmd" || {
diff --git a/tools/sof_perf_analyzer.py b/tools/sof_perf_analyzer.py
index 471ed773..601963d7 100755
--- a/tools/sof_perf_analyzer.py
+++ b/tools/sof_perf_analyzer.py
@@ -155,15 +155,7 @@ def process_trace_file():
     ts_shift = 0
     with open(args.filename, 'r', encoding='utf8') as file:
         trace_item_gen = make_trace_item(file)
-        trace_prev = None
-        try:
-            if args.skip_to_first_trace:
-                trace_prev = skip_to_first_trace(trace_item_gen)
-            else:
-                trace_prev = next(trace_item_gen)
-        except StopIteration as si:
-            si.args = ('No valid trace in provided file',)
-            raise
+        trace_prev = next(trace_item_gen)
         for trace_curr in trace_item_gen:
             # pylint: disable=W0603
             old_ts_shift = ts_shift
@@ -279,11 +271,6 @@ def parse_args():
                     help='Output SOF performance statistics to csv file')
     parser.add_argument('--out2html', type=pathlib.Path, required=False,
                     help='Output SOF performance statistics to html file')
-    parser.add_argument('-s', '--skip-to-first-trace', action="store_true",  default=False,
-                        help='''In CI test, some traces from previous test case will appear in
-the mtrace of current test case, this flag is used to denote if we
-want to skip until the first line with a timestamp between 0 and 1s.
-For CI test, set the flag to True''')
 
     return parser.parse_args()