Preston tried and held on till first half which ended goalless unfortunately fell in the second half as the team couldn't hold on as they conceded four goal in the second half Chelsea, no doubt is the better side having dominated the match with 70% possession and 12 shots on target against the championship side, remember FA Cup is usually synonymous with upset I believe Chelsea was a bit cautious not to concede against Preston they are frustrated in the first half, though you are worried about Chelsea sluggish style of play but I believe that would change with time because Pochettino hasn't gotten a real first eleven squad yet and once the team clicks they would be unstoppable.
In the first half, Chelsea were not very persistent and indeed this result was not surprising because in terms of quality Chelsea were much better and they deserved to win with a convincing score.
I think what happened in the first half is not a significant problem because what is needed is the final result and Chelsea won as predicted, there were no surprises in this match.
Preston who only plays in the Championship or under the Premier League, it is clear that Preston does not have good quality. What's more, at this moment Preston is also only in the middle in the Championship table and thus, it is certainly a natural result if in the match againts Chelsea the fact that Preston also did not manage to make a good resistance.
Because after all, the fact is that Chelsea dominated this match and also, even though at half time the result was a 0-0 draw but ya, that Chelsea still had very good statistics also at half time. Therefore, in the second half Chelsea can maximize the opportunities it gets and convert them into goals and ya, at least this victory can boost the team's morale to get good results also in the Premier League.
Chelsea displayed their usual struggles in the first half, but the second half was brilliant! They scored four goals against Preston. Sterling delivered a stellar performance, seemingly under some ethereal influence, while Enzo Fernandez, Thiago Silva, and Levi Colwill elevated their game to orgasmic levels. Overall, a great game. Three wins in a row – Chelsea is at their best, grinning with a massive victory. While they can't fully assess their form against Preston, Chelsea takes the positives and aims to build a winning mentality moving forward.