Abstract Background The cardiopulmonary resuscitation guidelines revised in 2015 recommend target chest compression rate (CCR) and chest compression depth (CCD) of 100–120 compressions per minute (cpm) and 5–6 cm, respectively. We hypothesized that the new guidelines are harder to comply with, even with proper feedback. Methods This prospective observational study using data collected from the participants of an Immediate Cardiac Life Support course included the evaluation of chest compressions using performance data from a feedback device after the completion of the course. Participants completed chest compressions for 1 min and were provided with feedback, after which they performed another cycle of CC. Primary outcome measures were CCR and CCD as well as the correct CCR percentage and CCD percentage for pre and post feedback. Results The study included a total of 88 participants. The median pre-CCR was 112.5 cpm (interquartile range [IQR] 108–116 cpm), and the median correct pre-CCR percentage was 96% (IQR 82.5–99.5%). After the feedback, there was a slight increase in the correct CCR percentage (99% [IQR 92.5–100%]). Conversely, the median pre-CCD was 5.4 cm (IQR 4.9–5.8 cm), and the median pre-correct CCD percentage was 66% (IQR 18.5–90%). The increase in the median post-correct CCD percentage to 72% (IQR 27–94%) observed after the feedback was not statistically significant (P = 0.361). Conclusions Compliance with the new guidelines for chest compressions, especially those regarding the CCD, might be difficult. However, whether the changes in guidelines affect outcomes in actual clinical settings is uncertain and requires further investigation.