I have submitted a mathematical-physics manuscript to Journal of Mathematical Physics, and I am in a situation similar to the one described here: It has been two months since I submitted, and the editor still cannot find reviewers. I have asked the editor what happens if he/she keeps trying and will still be unable find any reviewer, but he/she refuses to answer me.
The manuscript is in the field of celestial mechanics and is quite specific. However, two months seems a pretty long time to me, and I am incline to think that this is the journal's fault, i.e., the journal or editor is not known enough, he/she does not have a good network of referees, and I feel that I am wasting my time and should withdraw my submission and submit it to another journal.
Do you concur with this? According to your experience, what is the best decision to make sure that the manuscript is published in a reasonable time in this journal, or in another journal with similar impact?